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For years, small businesses had two choices for endpoint protection: consumer antivirus that couldn’t keep up with modern threats, or enterprise security platforms priced well beyond what a 15-person company could justify. Microsoft Defender for Business changed that equation.
Defender for Business brings the same core detection and response engine used by large enterprises — built on the same Microsoft Defender for Endpoint technology — into a product designed for businesses with up to 300 users, at $4.10 CAD per user per month as a standalone, or included with Microsoft 365 Business Premium.
If your business runs Microsoft 365, this is the endpoint protection conversation you should be having with your MSP.
What Defender for Business Actually Does
This is not the basic Windows Defender that comes with Windows 10 and 11. That built-in tool provides real-time antivirus scanning. Defender for Business is a managed endpoint protection platform with capabilities that, until recently, were only available in enterprise licences priced well above it.
Endpoint Detection and Response (EDR)
Traditional antivirus works on signatures — it recognises known threats. EDR goes further. It monitors device behaviour continuously, looking for patterns that indicate an attack in progress: unusual process execution, suspicious registry changes, lateral movement between devices, credential theft attempts.
When EDR detects something, it doesn’t just alert — it provides a full timeline of what happened, which devices were affected, and what the attacker did. For an MSP monitoring your environment, this is the difference between knowing “malware was found” and knowing “an attacker gained access through a phishing email at 2:14 PM, moved laterally to the file server, and attempted to exfiltrate data before being stopped.”
Automated Investigation and Remediation
When a threat is detected, Defender for Business can automatically investigate and remediate without waiting for a human to respond. It isolates compromised devices, removes malicious files, reverses registry changes, and terminates malicious processes — often within minutes of detection.
This matters because the window between initial compromise and ransomware deployment is shrinking. According to the Sophos State of Ransomware 2025 survey, the share of ransomware attacks that ended with data actually encrypted fell to 50% in 2025, down from 70% in 2024 — which Sophos reads as organisations getting better at stopping attacks before the payload deploys. Automated response is one factor in that improvement.
Threat and Vulnerability Management
Defender for Business continuously scans your devices for unpatched software, misconfigurations, and known vulnerabilities. It prioritises what needs attention based on real-world exploitability — not just severity scores — and can push recommendations directly to your MSP’s dashboard.
This is critical because, in the same Sophos survey, 32% of ransomware attacks in 2025 began with an exploited vulnerability, making it the most common technical root cause for the third year running — ahead of compromised credentials at 23%.
Attack Surface Reduction
A set of rules that proactively block common attack techniques before they execute: macro-based malware in Office documents, script execution from email attachments, credential theft from LSASS, and other techniques that ransomware operators rely on. These rules run silently in the background and stop attacks that antivirus may not catch until later — if at all.
Cross-Platform Coverage
Defender for Business isn’t Windows-only. It covers Windows, macOS, iOS, and Android devices — up to five devices per user licence. For businesses with a mixed device environment, this can remove the need to run separate security products on different platforms.
Why This Matters for Small Businesses
The threat landscape facing small businesses is not a scaled-down version of what enterprises face. In many ways, it’s worse.
88% of SMB breaches in 2025 involved ransomware, compared with 39% for large organisations, according to the Verizon 2025 Data Breach Investigations Report. The reason is straightforward: attackers know that smaller businesses typically have weaker defences, smaller security budgets, and less capacity to recover. Automated attacks don’t discriminate by company size — they scan for vulnerability.
The financial impact is real:
- The median ransom payment in 2025 was US$1 million, according to Sophos (a survey of organisations with 100 to 5,000 employees) — half the 2024 figure, but still a company-ending number for most small businesses
- The average cost to recover from a ransomware attack was US$1.53 million in the same survey — roughly $2 million CAD — excluding the ransom itself
- As of April 2026, when this post was written, surveys we reviewed put the share of SMBs saying they could not continue operating after a ransomware attack at around 75%
Against that backdrop, a tool that costs $4.10 CAD per user per month and provides enterprise-grade detection, automated response, and vulnerability management is a significant change in what’s available to small businesses.
What Makes It Different From Traditional Antivirus
| Capability | Traditional Antivirus | Defender for Business |
|---|---|---|
| Known malware detection | Yes | Yes |
| Behavioural threat detection | Limited | Full EDR |
| Automated investigation | No | Yes |
| Device isolation during attack | No | Yes |
| Vulnerability scanning | No | Continuous |
| Attack timeline and forensics | No | Full incident timeline |
| Cross-platform (Win/Mac/iOS/Android) | Varies | Yes (5 devices per user) |
| Cloud-managed dashboard | Varies | Yes (Microsoft Defender portal) |
| Threat intelligence | No | Microsoft threat intelligence network |
| Attack surface reduction rules | No | Yes |
As of April 2026, Microsoft reported that the underlying detection engine had been named a Leader in the Gartner Magic Quadrant for Endpoint Protection Platforms for six consecutive years through 2025, and that in the 2024 MITRE ATT&CK Evaluations Microsoft Defender XDR achieved 100% technique-level detection across all attack stages — meaning it detected every technique the evaluators used, across every phase of the attack chain.
That detection engine now ships in a $4.10 CAD/month product for businesses with under 300 users.
How It Fits With Microsoft 365 Business Premium
Most SMBs running Microsoft 365 are on either Business Basic, Business Standard, or Business Premium. Here’s the security picture:
- Business Basic / Standard: Includes basic Windows Defender antivirus. No EDR, no automated remediation, no vulnerability management. That leaves a real gap.
- Business Premium (roughly $30 CAD/user/month at Microsoft list as of April 2026): Includes Defender for Business, plus Intune device management, Microsoft Entra ID P1, and Microsoft Purview Information Protection. This is the licence tier where Microsoft’s security story comes together for SMBs. (At DVG Systems, a Business Premium user bundle is C$55.00 per user per month, which includes the Microsoft subscription plus EDR, ITDR, mailbox backup and DNS filtering for up to three devices — see our pricing.)
- Defender for Business standalone ($4.10 CAD/user/month Microsoft list): If you’re on Business Standard and not ready to upgrade to Premium, you can add Defender for Business as a standalone add-on. You get the endpoint protection without the full Premium bundle. (Through an MSP, expect the licence plus a charge for configuration, attack-surface-reduction tuning and ongoing policy maintenance; DVG quotes Microsoft subscriptions outside the standard bundle separately.)
For businesses already paying for Business Premium, Defender for Business is included — but it still needs to be configured and deployed. Having the licence is not the same as having the protection. Your MSP should be actively managing the deployment, tuning the policies, and monitoring the alerts.
Questions to Ask Your MSP
If you’re not sure where your business stands, these are the questions to put to your IT provider:
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What endpoint protection are we currently running? Is it traditional antivirus or a full EDR solution? If it’s antivirus-only, you’re missing detection capabilities that matter.
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Are we using Defender for Business, and is it fully deployed? Having the licence in your Microsoft 365 subscription doesn’t mean it’s active on every device. Deployment, policy configuration, and onboarding all require deliberate setup.
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Is automated investigation and remediation enabled? Some MSPs deploy Defender for Business in a passive or monitoring-only mode. Full value requires automated response to be turned on and tuned.
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Are you monitoring the alerts? Defender for Business generates alerts that need human review — not every alert, but the ones that automated systems escalate. Someone should be watching.
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What happens if ransomware gets through? Even the best endpoint protection isn’t 100%. Your MSP should be able to explain the response plan: device isolation, backup restoration, communication procedures, and recovery timeline.
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Are attack surface reduction rules configured? These are not configured by default and need to be enabled based on your environment. They’re one of the most effective preventive controls in the platform.
What Good Deployment Looks Like
A properly deployed Defender for Business environment includes:
- All devices onboarded — every Windows PC, Mac, and mobile device enrolled in the Defender portal
- EDR in active mode — not passive, not audit-only
- Automated remediation enabled — configured to automatically isolate and clean compromised devices
- Attack surface reduction rules — enabled and tuned for your environment (blocking macro execution, script-based attacks, credential theft)
- Vulnerability dashboard reviewed regularly — your MSP should be patching based on Defender’s prioritised recommendations
- Alert monitoring — either by your MSP’s SOC or through a managed detection and response (MDR) service
- Integration with Intune — for device compliance policies that enforce security baselines
The Bottom Line
Microsoft Defender for Business is one of the more significant shifts in endpoint protection for small businesses in the last decade. It puts genuine enterprise-grade security — EDR, automated response, vulnerability management, attack surface reduction — into a product that costs $4.10 CAD per user per month and integrates natively with the Microsoft 365 environment most SMBs already run.
The gap between what large enterprises and small businesses can afford in endpoint security is narrower than it has ever been. The question is whether your business is actually using what’s available — or still relying on the same antivirus approach that worked in 2015.
DVG Systems deploys and manages Microsoft Defender for Business for Northern Ontario businesses. If you’re not sure what endpoint protection you’re currently running, or whether Defender for Business is fully deployed in your environment, get in touch for a no-obligation review.
Sources and last verified
Last verified 11 September 2026. Microsoft list prices, licence entitlements and the ransomware statistics in this post change with each Microsoft price update and each annual Sophos and Verizon report.
- What is Microsoft Defender for Business?, Microsoft Learn: designed for up to 300 users; capability comparison with Defender for Endpoint.
- Microsoft Defender for Business frequently asked questions, Microsoft Learn: included in Microsoft 365 Business Premium; up to five client devices per user licence; Windows, Mac, Android and iOS support.
- Microsoft Defender for Business, Microsoft: CAD $4.10 per user per month (paid yearly), up to 300 users and five devices per user (link taken from the Microsoft Learn FAQ above).
- Automated investigation and response in Microsoft Defender for Endpoint, Microsoft Learn: automated investigation and remediation.
- Microsoft Defender Vulnerability Management, Microsoft Learn: continuous vulnerability discovery and prioritisation.
- Attack surface reduction overview and ASR rules reference, Microsoft Learn: what ASR rules block; rules default to “Not configured”.
- Microsoft Defender portal, Microsoft Learn: current name of the cloud-managed dashboard.
- Microsoft Intune in Microsoft 365 Business Premium, Microsoft Learn: Business Premium includes Intune Plan 1.
- The State of Ransomware 2025, Sophos (June 2025): encryption rate 50% (down from 70%); exploited vulnerabilities 32%, compromised credentials 23%; median ransom payment US$1 million; mean recovery cost US$1.53 million.
- 2025 Data Breach Investigations Report, Executive Summary, Verizon: ransomware in 88% of SMB breaches versus 39% at large organisations.