Microsoft is retiring Exchange Web Services (EWS) in Exchange Online by April 2027 and expanding Microsoft Graph API support for archive mailboxes. Organizations must migrate applications from EWS to Microsoft Graph APIs by October 2026 to maintain archive mailbox access, compliance, eDiscovery, and data lifecycle management.
Applies to: Microsoft Purview
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).