Microsoft Defender for Office 365 does not offer a free standalone version. According to G2's pricing data for Microsoft Defender for Office 365, the entry-level Plan 1 at $2.00 per month covers anti-phishing, anti-malware, spam protection, Safe Links, Safe Attachments, and protection across Teams, SharePoint, and OneDrive. Microsoft Defender for Office 365's Plan 2 at $5.00 per month adds advanced threat hunting via Threat Explorer, automated investigation and response, attack simulation training, and full Microsoft 365 Defender XDR capabilities. G2 reviewers note that Plan 1 lacks critical features like Threat Explorer and attack simulators, which are key drivers for upgrading to Plan 2.