Microsoft Defender for Endpoint Deployment Guide | Calance

Microsoft Defender for Endpoint deployment is the process of connecting your Windows, macOS, Linux, and mobile devices to Microsoft’s endpoint security platform and configuring the protections it offers. Done well, it takes five stages: confirm licensing and prerequisites, assign roles, choose an onboarding method that matches your device management tooling, onboard devices in rings, and configure next-generation protection, attack surface reduction, and endpoint detection and response (EDR). Most deployments run eight to 16 weeks, and the quality of protection you end up with depends far more on the configuration and rollout than on the product itself.

That last point is the reason this guide exists. Plenty of organizations already own Defender for Endpoint through Microsoft 365 E3 or E5, so buying it was never the hard part. The hard part is getting devices onboarded without breaking applications, getting off the old antivirus without a gap, and making sure someone is actually watching the alerts when it’s all done. Here’s how to do that, start to finish, based on Microsoft’s current documentation and what we’ve learned deploying Defender across Microsoft 365 environments at Calance.

Key takeaways

• Defender for Endpoint comes in two plans. Plan 1 covers prevention; Plan 2 adds detection, investigation, response, and vulnerability management. Servers need a separate license.
• Microsoft’s deployment guide has five steps: set up, assign roles, choose a deployment method, onboard devices, and configure capabilities.
• Your onboarding method should follow your device management tooling. Intune for cloud-managed devices, Configuration Manager for on-premises fleets, and Group Policy or scripts for the rest.
• Attack surface reduction rules belong in audit mode before block mode. Skipping that step is the fastest way to break a line-of-business application.
• Migrating from a third-party product uses passive mode. Defender runs alongside the old tool, you confirm it works, and then you remove the old tool.
• A ring-based rollout with exit criteria per ring is what Microsoft recommends, and it’s what keeps help desk volume down.

What is Microsoft Defender for Endpoint, and how does it work?

Microsoft Defender for Endpoint is Microsoft’s endpoint security platform for Windows, macOS, Linux, Android, and iOS. It combines next-generation antivirus, attack surface reduction, EDR, automated investigation, and vulnerability management, and it reports into the Microsoft Defender portal, where Microsoft Defender XDR correlates endpoint signals with identity, email, and cloud app activity. If you’ve only ever thought of it as “the antivirus that comes with Windows,” it helps to understand the three pieces that actually do the work.

The three components that matter for deployment

Microsoft Defender Antivirus handles real-time scanning and behavior monitoring. It’s the part that blocks a malicious file when it lands on disk.

The Defender for Endpoint sensor collects telemetry from the device and sends it to Microsoft’s cloud. That’s where detections, investigations, and response actions run. Onboarding a device means connecting this sensor.

Attack surface reduction controls block common attack techniques before they execute. That includes ASR rules, network protection, controlled folder access, and web protection.

Here’s why this matters: these three pieces are configured separately. Onboarding connects the sensor, and that’s all it does. It doesn’t turn on ASR rules, tune antivirus policy, or enable tamper protection. A device can show as “onboarded” in the portal and still be running with most of its protection switched off. We’ll come back to this more than once.

How Defender for Endpoint fits into Defender XDR

Microsoft Defender XDR is the umbrella platform that pulls together signals from Defender for Endpoint, Defender for Office 365, Defender for Identity, and Defender for Cloud Apps into single incidents. Endpoint telemetry is the richest signal in that stack, so a solid endpoint deployment makes every other Defender product more useful. If you’re planning the wider suite, get the endpoint piece right first.

Which Defender for Endpoint plan do you need?

Defender for Endpoint Plan 1 provides prevention: next-generation protection, attack surface reduction, device control, web protection, and manual response actions. Plan 2 adds the capabilities most people mean when they say “EDR”: behavioral detections, automated investigation and remediation, advanced hunting, threat analytics, and the core features of Microsoft Defender Vulnerability Management. If you want detection and response, you need Plan 2.

How the plans compare

Licensing bundles change, so treat this table as a starting point and confirm against Microsoft’s current licensing guidance before you plan. If the E3 versus E5 decision is still open, our comparison of Microsoft 365 E3, E5, and E7 licensing walks through the security bundles.

Two licensing details that catch people out

First, Plan 1 and Plan 2 don’t include servers. Server coverage needs Microsoft Defender for Servers (through Defender for Cloud), Defender for Endpoint Server, or Defender for Business Servers. Microsoft’s minimum requirements page is explicit about this, and it’s the licensing gap we see most often in compliance reviews.

Second, if you’re not sure Plan 2 is worth it, Microsoft offers a trial. Running the trial on a pilot ring is a cheap way to find out whether your team will use advanced hunting or whether Plan 1 plus a managed service makes more sense.

What are the prerequisites for deploying Defender for Endpoint?

Before you onboard a single device, you need a Security Administrator role, licenses assigned, supported operating systems, outbound connectivity to Defender’s cloud endpoints, Microsoft Defender Antivirus present on each device, and a complete inventory of what you’re protecting. Microsoft lists these requirements in its minimum requirements for Microsoft Defender for Endpoint documentation, and every one of them causes delays when it’s skipped.

Supported operating systems

Windows 10 and 11 across Enterprise, Pro, Education, and IoT Enterprise editions, including Windows on ARM. Windows Enterprise LTSC 2016 and later. Windows Server 2012 R2 and later, including Core installations. macOS, Linux, Android, and iOS. Windows 365 Cloud PCs and Azure Virtual Desktop machines running supported versions.

Older systems aren’t completely out. Windows 7 SP1, Windows 8.1, and Windows Server 2008 R2 SP1 can be onboarded through the Defender deployment tool or the Microsoft Monitoring Agent, but with reduced capability. If you still have those in production, plan to replace them; Defender will keep them visible but not fully protected.

Hardware, network, and data location

Hardware requirements are the same as the operating system’s: two cores minimum (four preferred) and 1 GB of memory minimum (4 GB preferred). Nothing extra.

Devices need outbound internet access to Defender’s service URLs, either directly or through a proxy. Microsoft now offers two connectivity types: streamlined, which consolidates the required URLs into a smaller set, and standard. You choose during onboarding, and the choice decides what your firewall and proxy rules need to allow. IPv4 must be enabled; IPv6-only environments need DNS64/NAT64 transition mechanisms.

During setup, review the available Defender data regions for your tenant. Microsoft lists the EU, UK, US, Australia, Switzerland, India, and UAE for Defender for Endpoint, with provisioning options depending on the service and tenant. The selected region cannot be changed after setup, so confirm residency requirements with compliance first.

The Microsoft Defender Antivirus dependency

The Defender for Endpoint sensor depends on Microsoft Defender Antivirus to scan files. If Group Policy has disabled Defender Antivirus somewhere in your estate, onboarded devices must be excluded from that policy. And if a third-party antivirus is active, the Defender Antivirus ELAM driver still needs to be enabled for onboarding to succeed. Both are easy to miss and both show up as “onboarding failed” with no obvious cause.

The inventory

Microsoft’s deployment planning guide asks for endpoint count by operating system, server count by version, your management engine (Intune, Configuration Manager, or both), how your security operations are structured, and what SIEM you use. Build this inventory properly. It’s the step that surfaces unmanaged devices, servers nobody owns, and the one Linux box someone stood up two years ago, and all of that changes scope before you’ve onboarded anything.

How should you plan a Defender for Endpoint deployment?

Microsoft’s deployment guide is built around five steps: set up the environment, assign roles and permissions, identify your architecture and choose a deployment method, onboard devices, and configure capabilities. The mistake is treating these as a checklist to finish in a week. Treat them as phases with sign-off between them.

Step 1: Set up the environment.

Validate licensing, confirm the tenant is ready, configure network settings so devices can reach the service, and make the data location decision.

Step 2: Assign roles and permissions

Microsoft recommends roles with the fewest permissions possible and reserves Global Administrator for emergencies. Decide who can view alerts, who can take response actions, and who can change policy. Role-based access control in the Defender portal lets you scope access by device group, which becomes important the moment you have more than one business unit.

Step 3: Identify your architecture

Write down whether your devices are cloud-native (Entra joined and Intune managed), co-managed, on-premises (domain joined and managed by Configuration Manager), or a mix. The answer decides your onboarding method, which is the next section.

Step 4: Onboard devices

Use a ring-based approach. There’s a full section on this below.

Step 5: Configure capabilities

Next-generation protection, attack surface reduction, EDR settings, automated investigation, and vulnerability management. This is the step most deployments shortchange, and it’s where the protection actually comes from.

One planning note Microsoft calls out and we’d underline: if you intend to run Defender alongside another security product, even temporarily, read Microsoft’s side-by-side considerations first and configure mutual exclusions. Two agents scanning each other’s files is the classic cause of “Defender made everything slow.”

Which onboarding method should you use?

Your onboarding method should follow your device management tooling. Use Intune for cloud-managed devices, Microsoft Configuration Manager for on-premises fleets, Group Policy or local scripts where neither is in place, and platform-specific packages for macOS, Linux, and mobile. Picking based on tooling rather than preference means you don’t end up running two management systems for one agent.

Onboarding methods compared

For most organizations moving toward cloud management, Defender onboarding and Intune policy work end up as one project, because the endpoint security policies that configure Defender live in Intune. Our Microsoft Intune services team usually runs them together for that reason.

Two methods worth knowing about

Security settings management lets Defender for Endpoint enforce antivirus, firewall, and EDR policies on devices that aren’t enrolled in Intune. It’s the answer for servers and for the handful of devices that sit outside your MDM for good reasons.

Update channels for macOS and Linux. Microsoft recommends putting a few non-Windows systems on the Beta or Preview channel so compatibility problems appear before the Current channel gets them. Switching channels later requires a reinstall, so decide at onboarding.

Which capabilities should you configure, and in what order?

Configure in order of risk reduction and disruption: next-generation protection and tamper protection first, then EDR settings and automated investigation, then attack surface reduction in audit mode, then ASR in block mode once the telemetry is clean, then vulnerability management and device discovery. Enabling everything at once in block mode is how deployments generate a flood of help desk tickets in week one.

Next-generation protection and tamper protection

Start with Microsoft Defender Antivirus settings: cloud-delivered protection, real-time protection, cloud block level, sample submission, and scheduled scans. Align with Microsoft’s security baseline rather than inventing a policy from scratch.

Then turn on tamper protection. It stops users and malware from disabling Defender Antivirus or changing its settings, and disabling antivirus is routinely an attacker’s first move. One side effect to know: once tamper protection is on, Group Policy changes to Defender Antivirus settings are ignored. Make antivirus policy changes through Intune or the Defender portal from that point on.

EDR settings and EDR in block mode

EDR in block mode lets Defender for Endpoint remediate threats it detects after the fact, even when Defender Antivirus is sitting in passive mode behind a third-party product. It’s an additional layer of protection during migrations and helps reduce the risk of leaving a detection and response gap while the two products run side by side.

Automated investigation and remediation

Set the automation level per device group. Full automation removes malicious artifacts without asking; semi-automation waits for approval. A common and sensible starting point is full automation on workstations and semi-automation on servers.

Attack surface reduction rules

There are more than a dozen ASR rules covering Office macros, script obfuscation, credential theft from LSASS, executable content from email, and more. Each supports audit, block, and warn modes.

Why audit mode comes first

Test most ASR rules in audit mode before moving to block or warn mode, following Microsoft’s ASR testing guidance. Microsoft notes that some standard protection rules can usually start in block or warn mode without testing. A two- to four-week evaluation period can help cover a month-end close and a patch cycle, so the periodic business processes that only run once a month generate telemetry. Review the Reports page in the Defender portal to see what would have been blocked, add exclusions for legitimate line-of-business behavior, and only then move to block.

Which rules to watch most carefully

Rules that interact with Office applications and credential access tend to surface the most application conflicts, particularly in finance and engineering environments with macro-driven workbooks and legacy plugins. Audit mode finds those before users do.

Network protection, web protection, and controlled folder access

Network protection blocks outbound connections to malicious domains and is a prerequisite for several other features, including web content filtering and custom indicators. Turn it on early. Controlled folder access protects designated folders from unauthorized changes, which directly limits what ransomware can encrypt, but it generates false positives with some backup and sync tools. Audit first, as with ASR.

Device discovery

Onboarded devices can discover unmanaged devices on the same network. Microsoft’s device discovery configuration guidance explains how standard discovery uses active scanning and basic discovery uses passive observation. Standard discovery is the recommended mode for supported environments. Turn it on where appropriate. The unmanaged device list is almost always longer than anyone expected.

Microsoft Defender Vulnerability Management

Plan 2 includes the core features: software inventory, vulnerability assessment, and exposure scoring. Connect the remediation workflow to your ticketing system so findings become tasks with owners rather than a dashboard nobody opens. If you run periodic external scans as well, our vulnerability assessment service complements the continuous view Defender provides.

How do you migrate from third-party antivirus or EDR to Defender?

Migration follows three phases in Microsoft’s guidance: prepare, set up, and onboard. The sequence keeps your existing product active until Defender is proven, which is the whole reason it works. You don’t uninstall anything until the end.

Phase 1: Prepare

Update devices, confirm Plan 1 or Plan 2 licensing, plan roles and permissions, configure proxy and internet settings, and capture baseline performance data so you can compare before and after. That baseline is worth the effort; it’s your defense when someone blames Defender for a slow laptop that was already slow.

Phase 2: Set up

Enable or reinstall Microsoft Defender Antivirus and confirm it’s in passive mode. Passive mode means Defender Antivirus runs, updates its signatures, and reports but doesn’t perform real-time protection or remediation while another product is the active antivirus.

Then configure your Defender for Endpoint capabilities, add Defender for Endpoint to the exclusion list of the existing product, add the existing product to Defender Antivirus exclusions, and set up device groups.

The step most teams rush

Mutual exclusions. Without them, the two products scan each other’s binaries, the device slows down, and Defender gets the blame. Set exclusions on both sides before you onboard a single device.

Phase 3: Onboard

Onboard devices, run Microsoft’s detection test to confirm the sensor is reporting, verify Defender Antivirus is still in passive mode, confirm security intelligence updates are flowing, uninstall the existing product, and verify Defender Antivirus switches to active mode and everything works. Microsoft’s migration onboarding instructions explain how to verify the transition and confirm that protection is operating correctly.

A few practical notes. On Windows Server, passive mode isn’t automatic; you set it with a registry key before onboarding if a third-party antivirus is installed. On Windows clients, Defender Antivirus drops into passive mode on its own when another registered antivirus is active and the device is onboarded. Once the third-party product is removed, Defender Antivirus should return to active mode automatically; confirm it with Get-MpComputerStatus in PowerShell and check that AMRunningMode reads Normal.

If you’re keeping the third-party EDR

Some organizations keep their existing EDR as the primary tool and use Defender for vulnerability management and XDR correlation only. In that case passive mode is a long-term configuration, not a transitional one, and EDR in block mode gives Defender a limited remediation role behind the other product. Our endpoint detection and response services cover both single-vendor and coexistence designs.

How do you cover servers?

Servers need a separate license and often a separate onboarding path. Microsoft Defender for Servers, part of Microsoft Defender for Cloud, is the usual choice for Azure, hybrid, and multi-cloud estates; Defender for Endpoint Server and Defender for Business servers cover other cases. Windows Server 2012 R2 and later, plus supported Linux distributions, are covered.

Defender for Servers plans

Defender for Servers Plan 1 provides Defender for Endpoint integration for servers at a lower price. Plan 2 adds Defender for Cloud features such as agentless scanning, file integrity monitoring, and just-in-time virtual machine access. For servers outside Azure, Azure Arc connects them so Defender for Cloud can manage them as if they were Azure resources. Arc rollout and Defender onboarding usually happen together, which is the work our Azure managed services team handles.

Server-specific configuration

Set automated investigation more conservatively than on workstations. Confirm passive mode behavior if a third-party antivirus is present. Exclude database and backup paths according to the vendor’s guidance. Test ASR rules on a representative server before block mode. And give domain controllers their own pilot ring; they’re the servers you least want to surprise.

How should you structure the pilot and rollout?

Microsoft recommends a ring-based rollout with exit criteria per ring. The example in its documentation is Ring 1 (evaluate, about 50 devices), Ring 2 (pilot, the next 50 to 100 production devices), and Ring 3 (full deployment in larger increments). Rings limit the blast radius of a misconfiguration and give you real telemetry before policy reaches everyone.

The three rings

Exit criteria that actually mean something

Microsoft’s exit criteria for each ring are that devices appear in the device inventory, alerts appear in the dashboard, a detection test succeeds, and a simulated attack runs on a device. Add two of your own: help desk ticket volume compared with the week before, and sign-off from the owner of every application that showed up in ASR audit telemetry.

Build rings around device types, not head counts

A ring made up of 50 standard laptops tells you nothing about the engineering workstation with a legacy CAD plugin, the finance desktop with macro-driven workbooks, or the shared kiosk in the warehouse. Every device class and every line-of-business application owner belongs in the pilot. That way the pilot is a rehearsal of production, not a test of whether the agent installs.

How do you validate that the deployment worked?

Validation has four layers: the sensor reports, protection is active, detections fire, and the organization can respond. Most teams check only the first layer, which is how “fully deployed” estates end up with devices in passive mode and ASR rules that never left audit.

Layer 1: Sensor health

Every device shows in the Defender portal inventory with sensor health Active, not Inactive or Misconfigured. Run Microsoft’s detection test on a sample from each ring.

Layer 2: Protection state

Confirm Defender Antivirus is in active mode (unless passive is intended), tamper protection is on, cloud-delivered protection is enabled, and security intelligence is current. The device health reports in the Defender portal show this across the estate.

Layer 3: Detection and response

Run a simulated attack from the portal’s evaluation lab or Microsoft’s attack simulation scripts. Confirm an alert fires and that automated investigation runs at the level you configured.

Layer 4: Operational readiness

Someone receives the alert, knows the severity, and knows what to do next. If that person doesn’t exist, the deployment isn’t finished. This is usually the point where organizations decide between building a security operations function and using a managed detection and response service.

The compliance angle

Many cyber insurance applications now ask whether EDR is deployed on all endpoints and whether it’s monitored around the clock. Defender’s reporting answers the first question; who watches it answers the second. Our cyber insurance readiness packages map Defender evidence to the questions insurers ask.

What are the most common deployment mistakes?

The common mistakes are predictable: onboarding without configuring, enabling ASR in block mode without an audit period, skipping mutual exclusions during migration, forgetting servers need a separate license, leaving tamper protection off, choosing the wrong data region, letting legacy Group Policy fight Intune, and declaring victory with nobody watching the alerts.

Onboarding without configuring

The device appears in the portal, the project is closed, and protection stays at defaults. Defaults are reasonable but untuned, and ASR rules stay off.

Block mode first

ASR rules go straight to block, a finance macro stops working at month-end, and the rules get disabled estate-wide instead of adjusted.

No mutual exclusions

Two agents scan each other, performance drops, and Defender takes the blame.

Servers forgotten in licensing

Workstation licensing is sorted, servers get onboarded, and a compliance review months later finds them unlicensed.

Tamper protection left off

Attackers disable antivirus as a first step. Tamper protection is the control that stops it, and it costs nothing to enable.

Wrong data region

The region selected at provisioning does not meet the organization's data-residency requirements. Confirm available regions and restrictions before setup.

Group Policy conflicts

Legacy Group Policy still disables Defender Antivirus or sets conflicting exclusions on devices now managed by Intune, so settings flip depending on which policy applied last.

Nobody owns the alerts

Plan 2 generates incidents. If the team has no capacity to triage them, the value of the license goes unrealized.

How long does a Defender for Endpoint deployment take?

A deployment covering workstations and servers typically runs eight to 16 weeks from assessment to handover, with the pilot and ASR audit period taking most of the calendar time. Smaller single-platform estates with Intune already in place finish faster; multi-platform estates with strict change control, a third-party migration, or server coverage through Defender for Cloud take longer.

Phase-by-phase

The ASR audit period is the phase everyone wants to shorten and the one they most regret shortening.

What does ongoing management look like?

After deployment, Defender for Endpoint needs a monthly rhythm: review new ASR rule releases and Microsoft’s baseline updates, check device health for inactive or misconfigured sensors, review automated investigation outcomes, work the vulnerability management queue, and audit exclusions so temporary ones don’t become permanent. Alert triage runs daily, or continuously if you have 24/7 coverage.

Deciding the operating model early

Three patterns are common. The internal team operates everything, which works when there’s real capacity for daily triage. The internal team administers policy while a provider handles monitoring and response. Or a provider handles both under a co-managed arrangement. Pick one during planning, not after handover, so the deployment has somewhere to land.

Connecting Defender to the rest of the stack

Defender gets more valuable when the surrounding Microsoft security controls are configured well. Conditional Access policies that use device risk signals from Defender, for example, are part of a zero trust architecture that turns endpoint telemetry into access decisions rather than just alerts.

Should you deploy in-house or with a partner?

Deploy in-house when you have Intune or Configuration Manager expertise, someone who has run ASR rules in a production estate before, and the capacity to operate the result afterward. Use a partner when any of those is missing, when a third-party migration is involved, or when the deadline is set by an audit, an insurance renewal, or a contract ending on the old product.

In-house versus partner-led

Where Calance fits

Defender deployments at Calance draw on the same team that handles Microsoft 365, Intune, and Azure work, under Microsoft Solutions Partner designations in Modern Work and Security and more than 20 years on the Microsoft platform. Pilot rings, audit mode before block mode, mutual exclusions during migration, and application owner sign-off are standard steps rather than optional extras. Our Microsoft 365 security baseline case study shows how that approach plays out across a full tenant.

Recommendations by scenario

Small business on Microsoft 365 Business Premium

Use Microsoft Defender for Business, which is included. Onboard through Intune, enable the default security policies, turn on tamper protection, and run ASR rules in audit for two weeks before block. Decide who watches alerts; at this size it’s often a provider.

Mid-market organization already using Intune

Deploy Plan 2 through Intune endpoint security policies. Build pilot rings by device class and application owner. Use security settings management for anything not in Intune. Decide the operating model before the rollout finishes.

Hybrid environment with on-premises servers

Workstations through Intune or Configuration Manager; servers through Defender for Servers with Azure Arc for non-Azure machines. Separate pilot rings for domain controllers, database servers, and application servers. Conservative automation levels on servers.

Regulated industry

Choose the data region with compliance present. Document ASR rule decisions and exclusions as controls. Set automated investigation to semi-automation where change control requires approval. Map Defender reporting to audit and insurance evidence from the start.

Organization migrating from a third-party EDR

Follow the three-phase migration: prepare, set up with passive mode and mutual exclusions, onboard and verify, then remove. Keep EDR in block mode on throughout. Run both products side by side for at least one full patch cycle before removal.

Getting the deployment right the first time

Microsoft Defender for Endpoint deployment comes down to planning, sequencing, and ownership rather than the product. Confirm licenses, including servers; inventory the estate; choose the onboarding method your tooling supports; configure in order of risk; run ASR in audit before block; migrate through passive mode; roll out in rings with exit criteria; and decide who watches the alerts before the project closes. If you’d like a scoped assessment of your environment, licensing position, and a phased deployment plan, our endpoint detection and response services team starts with a licensing and readiness review and sets out a timeline grounded in your estate.

FAQ

Does Microsoft Defender for Endpoint replace antivirus?

Yes. Defender for Endpoint includes Microsoft Defender Antivirus as its next-generation protection component, so a full deployment replaces third-party antivirus as well as EDR on Windows, macOS, and Linux.

Can Defender for Endpoint run alongside another antivirus?

Yes, in passive mode. Microsoft Defender Antivirus runs without performing real-time protection while another product is active, and Defender for Endpoint still collects telemetry and can remediate through EDR in block mode.

What is the difference between Defender for Endpoint and Defender for Business?

Defender for Business is a simplified version for businesses with up to 300 users, included in Microsoft 365 Business Premium. It has default policies and fewer advanced hunting features. Defender for Endpoint Plan 2 is the enterprise product.

Do servers need a different license?

Yes. Defender for Endpoint Plan 1 and Plan 2 don’t include servers. Use Defender for Servers through Defender for Cloud, Defender for Endpoint Server, or Defender for Business servers.

How long should ASR rules stay in audit mode?

Two to four weeks is typical, long enough to cover a month-end close and a patch cycle, so periodic business processes generate telemetry before block mode is enabled.

Can Defender for Endpoint be deployed without Intune?

Yes. Configuration Manager, Group Policy, local scripts, and VDI onboarding packages all work. Security settings management can also push Defender policies to devices that aren’t enrolled in Intune.

What happens if tamper protection is on and I need to change antivirus settings?

Change them through Intune or the Microsoft Defender portal. Group Policy changes to Defender Antivirus settings are ignored while tamper protection is on.

Does Defender for Endpoint work on Windows Server 2012 R2?

Yes. Windows Server 2012 R2 and later are supported, with the unified agent providing the current feature set. Windows Server 2008 R2 SP1 can be onboarded with the Defender deployment tool with reduced capability.

How do you confirm that Defender for Endpoint onboarding succeeded?

Check that each device appears in the Microsoft Defender portal with a healthy sensor status. Run a detection test on representative devices, then confirm the alert reaches the intended security team and response workflow.

Should you deploy Defender for Endpoint to every device at once?

No. Begin with IT-owned test devices, expand to representative business users and device types, then deploy in production waves. Require successful detection tests, acceptable performance, and application-owner approval before each expansion.

How do you choose between Intune and Configuration Manager for onboarding?

Use the management system already responsible for the device. Intune suits cloud-managed endpoints, while Configuration Manager suits fleets managed on premises. Mixed environments can use both, with policies and ownership documented before deployment.

What is EDR in block mode during an antivirus migration?

EDR in block mode lets Defender for Endpoint take certain remediation actions when Microsoft Defender Antivirus is passive behind another antivirus product. It is not a replacement for checking antivirus state and detection coverage.

How should organizations handle applications affected by ASR rules?

Start applicable ASR rules in audit mode, inspect events, and identify legitimate business processes that would be blocked. Test narrowly scoped exclusions with application owners before changing affected rules to block or warn mode.

How do you monitor Defender for Endpoint after deployment?

Review inactive sensors, security alerts, investigation results, software vulnerabilities, and policy exceptions on a scheduled basis. Assign named owners for daily alert triage and document how urgent incidents are escalated and resolved.

What should be included in the Defender for Endpoint handover?

Provide a device coverage report, license inventory, applied policies, exclusions, ASR testing results, remaining risks, and response procedures. Identify who owns device onboarding, security alerts, vulnerability remediation, and future policy changes.