Microsoft Defender for Office 365
By Microsoft
Defender for Office 365 adds impersonation protection, attachment scanning and quarantine controls on top of the basic filtering that every Microsoft 365 cloud mailbox already has. Plan 1 lists at $2 per user a month and Plan 2 at $5, both paid yearly. Microsoft's documentation describes it for Microsoft 365 cloud mailboxes.
- From
- $2 a month
- Free plan
- No
- Free trial
- 90 days
- Prices checked
- November 4, 2026
Pricing
Checked November 4, 2026 on the vendor's pricing page. Free trial: 90 days.
| Plan | Price | Charged | Notes |
|---|---|---|---|
| Plan 1 | $2 a month | per user | Paid yearly on an annual subscription that auto-renews |
| Plan 2 | $5 a month | per user | Paid yearly on an annual subscription that auto-renews. Adds tracking of cyberthreat campaigns that might affect your organization |
Categories it qualifies for
Facts we checked
- Impersonation protection for users and domains is available only in Defender for Office 365. Microsoft's anti-phishing policies for all cloud mailboxes cover spoofing but not impersonation. Source, checked November 4, 2026
- Each anti-phishing policy can protect up to 350 users and 50 custom domains from impersonation, and by default no senders or domains are configured. Source, checked November 4, 2026
- Malware and high-confidence phishing messages are always quarantined, and quarantine cannot be turned off. Users cannot release their own quarantined malware messages. Source, checked November 4, 2026
- Spam and phishing quarantine is kept for 15 days in the default anti-spam policy and 30 days in the Standard and Strict preset policies. Malware quarantine is kept for 30 days and cannot be changed. Source, checked November 4, 2026
- Microsoft offers a 90-day trial of Defender for Office 365 Plan 2 through the Microsoft Defender portal. Source, checked November 4, 2026
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Who pays us
Microsoft does not pay us anything.