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Microsoft has announced the deprecation of Exchange Web Services (EWS) in Exchange Online, with the initial phase-out target of October 1, 2026. Veeam Backup for Microsoft 365 and Veeam Data Cloud for Microsoft 365 currently leverage EWS for Exchange Online backup functionality. Note: This article previously stated, "Starting July 1, 2026, Microsoft will begin blocking EWS access for Frontline Worker mailbox types (Kiosk, F1, and F3) as the first enforcement step of the EWS deprecation." However, on June 11, Microsoft updated the blog post titled "Update to EWS Access for Kiosk / Frontline Worker Licensed Users" to change that deadline to October 1, 2026.
Veeam software that currently uses EWS will be transitioned to the Microsoft Graph API to ensure continued compatibility and data protection capabilities. As part of this transition, permission changes are required for all Veeam customers protecting Microsoft 365 data. For Veeam Data Cloud for Microsoft 365 customers, the application logic will be updated in the service. Performing app reauthorization will assign the permissions necessary. For Veeam Backup for Microsoft 365, an upcoming release will provide support for the transition from EWS to Microsoft Graph. Veeam is actively working on the transition to Microsoft Graph, and aiming to meet transition deadlines. Keep in mind that as some of these features are still in development on the Microsoft side, timelines are still subject to change. Should you wish to maintain EWS access, you can either configure EWS access manually on an App ID level or on an organization and mailbox level.
What happens if permissions are not added before the EWS deprecation? Once Microsoft retires EWS access, backups will fail until the required permissions are added. You can add the permissions at any time and backups will resume; however, the first backup afterward will be a full sync backup, and a coverage gap will exist during the period the permissions were missing. Veeam Backup for Microsoft 365 customers will also need to upgrade to the upcoming release once it becomes available.
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