Defender for Business brings endpoint detection and response (EDR) to small and medium businesses for the first time. What it covers, what it doesn't, and how an MSP makes it work properly.
Key takeaways
- 1Next-generation antivirus — cloud-delivered, AI-powered threat detection beyond signature matching
- 2Endpoint Detection & Response (EDR) — detects attacks already in progress, not just known malware
- 3Attack Surface Reduction (ASR) rules — block common malware behaviour patterns before code even executes
- 4Automated investigation and remediation — threats are contained and remediated without manual analyst effort
- 5Threat & Vulnerability Management — continuously identifies unpatched software and misconfigured settings
Until 2022, enterprise-grade endpoint detection and response (EDR) was essentially out of reach for small businesses — either too expensive or too complex to manage without a dedicated security team. Microsoft Defender for Business changed that, bundling a genuine EDR capability into Microsoft 365 Business Premium.
What Defender for Business includes
- Next-generation antivirus — cloud-delivered, AI-powered threat detection beyond signature matching
- Endpoint Detection & Response (EDR) — detects attacks already in progress, not just known malware
- Attack Surface Reduction (ASR) rules — block common malware behaviour patterns before code even executes
- Automated investigation and remediation — threats are contained and remediated without manual analyst effort
- Threat & Vulnerability Management — continuously identifies unpatched software and misconfigured settings
- Defender for Office 365 P1 — anti-phishing, safe links, and safe attachment scanning in email and Teams
What Defender for Business is not
Defender for Business is not a fully managed SIEM or SOC. It generates alerts that need to be reviewed by someone. Without an MSP monitoring the portal, alerts can go unseen for days. The automated remediation handles many threats, but complex attacks — particularly hands-on-keyboard ransomware — need a human response.
How Optimyze adds the missing layer
Optimyze's Security Operations Centre monitors Defender for Business alerts for all managed clients 24/7. We configure ASR rules at the appropriate level for each business, review Threat & Vulnerability Management reports monthly, and act on critical alerts immediately. When Defender raises an alert, someone at Optimyze sees it and responds — not just a dashboard that nobody is watching.
