Microsoft 365 admin center Usage reports domains will change starting mid-August 2026, with current and new domains active in parallel for at least 30 days. Organizations must update firewall, proxy, and scripts to include new domains to avoid access issues. Redirects and domain retirements will be announced later.
Applies to: Microsoft 365 suite
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).