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Microsoft Defender for Office 365 costs $2 to $5 per user/month as of November 2026, with 2 plans available. Plans: Microsoft Defender for Office 365 (Plan 1) at $2/user/month (billed annually), and Microsoft Defender for Office 365 (Plan 2) at $5/user/month (billed annually). Pricing depends on your chosen tier, contract length, and negotiated discounts.

Use the interactive pricing calculator to estimate your exact cost based on team size and requirements.

  • Free tier: No free tier available

Microsoft Defender for Office 365 offers 2 pricing tiers: Microsoft Defender for Office 365 (Plan 1), Microsoft Defender for Office 365 (Plan 2). Paid plans include Microsoft Defender for Office 365 (Plan 1) at $2/user/month (billed annually), Microsoft Defender for Office 365 (Plan 2) at $5/user/month (billed annually). The Microsoft Defender for Office 365 (Plan 2) plan is general users and teams.

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Know Before You Buy — See Microsoft Defender for Office 365 Plans

Microsoft Defender for Office 365 lists $2-$5/user/month, but hidden costs like implementation and support add to the total as of November 2026. Key hidden costs: microsoft 365 e3/e5 base subscription required: $36-57/user/month, audit log retention beyond 1 year: requires e5 compliance add-on, advanced compliance features: the e5 compliance add-on is a separate per-user charge on top of the base subscription. Verified from 5 sources by CostBench.

Hidden Costs Breakdown

1

Microsoft 365 E3/E5 base subscription required: $36-57/user/month

2

Audit log retention beyond 1 year: requires E5 Compliance add-on

3

Advanced compliance features: the E5 Compliance add-on is a separate per-user charge on top of the base subscription

4

Defender Suite bundle: a separately priced per-user bundle that covers most E5 security features on an E3 base

5

Premium support plans: additional cost beyond standard support

6

Training for security operations: Microsoft security training programs priced separately

Now You Know the Real Cost — See Microsoft Defender for Office 365 Plans

Check current Microsoft Defender for Office 365 pricing

Prices and terms change; verify against the live pricing page.

See Microsoft Defender for Office 365 Pricing