Microsoft Defender for Office 365 Plan 1

Microsoft email/collaboration threat protection with published SMB add-on pricing.

Price on their site SMB MSP-friendly

Pricing note

from $2/user/mo

Microsoft Security SMB pricing lists Defender for Office 365 Plan 1 at $2.00/user/month paid yearly. Also included in Microsoft 365 Business Premium. Plan 2 is higher / separate SKU.

Yearly budget (estimate when evidence exists): Under $5k/yr

Last verified: 2026-09-24

Commonly compared to (public alts)

Proofpoint Essentials, Barracuda, Mimecast

Deploy model

saas

Sources for claims

https://www.microsoft.com/en-us/security/business/siem-and-xdr/microsoft-defender-office-365
https://www.microsoft.com/en-us/security/pricing/small-medium-business