Google and the EWS retirement

Microsoft Graph migration status from Google's own notices. Last checked 2026-10-25.

Google Workspace Calendar interoperability with Microsoft Office 365 (Exchange availability)

Status
Migration announced
Date
2025-05-29
“we recommend that admins update their interop configuration to Graph API as soon as possible.”

Google Workspace Updates: Configure Calendar interoperability with Microsoft Office 365 using the Microsoft Graph API (2025-05-29), read 2026-10-25.

What to do. Google says the Graph API replaces EWS for Calendar interop with Exchange Online. An admin must reconfigure interop with the Graph API in the Admin console (Calendar Interop Management, Exchange availability in Calendar) before EWS support ends on 1 Oct 2026.

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