📅Microsoft Retiring Exchange Web Services in Exchange Online by 2027
Your EWS integrations are about to break
TL;DR
Microsoft is retiring Exchange Web Services (EWS) in Exchange Online by April 1, 2027, urging admins to migrate to Microsoft Graph. EWS in on-premises Exchange remains unaffected.
Microsoft is retiring Exchange Web Services (EWS) in Exchange Online, with the final retirement date set for April 1, 2027. This move affects integrations that rely on EWS for mailbox data access, including email, calendars, and contacts. Admins need to migrate to Microsoft Graph, though some capability gaps exist. The phased blocking of EWS starts on October 1, 2026, revealing any overlooked integrations. If you're still using EWS, now's the time to plan your migration to avoid disruptions.
Key Points
Microsoft is retiring EWS in Exchange Online by April 1, 2027, affecting all tenants.
Phased blocking of EWS starts October 1, 2026, revealing any overlooked integrations.
Microsoft recommends moving integrations to Microsoft Graph, though some capability gaps exist.
Admins can temporarily allow EWS by setting EwsEnabled to $true and adding approved apps to EwsAllowedAppIDs.
Organizations should monitor APIs as dependencies throughout their lifecycle to avoid support tickets.
Why It Matters
If you're using EWS in Exchange Online for mailbox data access, your integrations will break by April 1, 2027. Migrate to Microsoft Graph now to avoid disruptions. Some capability gaps exist, so plan your migration carefully.
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