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Microsoft is retiring Exchange Web Services (EWS) in Exchange Online. EWS is the protocol Veeam currently uses to back up Exchange Online mailboxes. Key dates: October 1, 2026 — Microsoft begins disabling EWS tenant by tenant. Tenants who have not explicitly enabled EWS will be automatically blocked as the rollout proceeds. April 1, 2027 — EWS is fully and permanently shut down for all tenants. Note: These EWS phase-out dates apply to all Exchange Online mailbox types (including Kiosk/F1/F3). Configuring EWSAllowedAppIDs as described in Step 2 will maintain backup access for all mailboxes through the end of the transition period. However, if you take no action before October 1, your Exchange Online mailbox backups will fail.
Exchange Online PowerShell Module Requirements The Exchange Online commands in this article are run using the Exchange Online PowerShell module. Instructions for installing or updating the module are provided in Install and update the Exchange Online PowerShell module, and instructions for connecting to the tenant are provided in Connect to Exchange Online PowerShell.
Restoring access If EWS is turned off for your tenant before you have completed the steps above, whether because your EWSEnabled was $null at the October 1 cutover, or for any other reason, you can restore access manually:
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