Microsoft Defender for Office 365 is migrating its data platform to improve performance, scalability, and data consistency across investigation and hunting tools. Phase 1 completed in June 2025; Phase 2 targets December 2025. Users may see slight data delays or brief loading issues, but no admin action is needed.
Applies to: Microsoft Defender XDR
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).