Microsoft eCDN analytics data retention is reduced from 360 to 180 days, effective July 27, 2026. Data older than 180 days will be deleted automatically. No changes to data collection, and no admin action is required, but review reporting relying on data older than 180 days.
Applies to: Microsoft 365 suite
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).