Exchange Web Services (EWS) Deprecation and Barracuda Cloud Archiving Service

Microsoft is retiring the Exchange Web Services (EWS) API for Exchange Online, requiring applications that rely on EWS to migrate to newer APIs. Deprecation is planned to take full effect in October 2026. For more details, see Microsoft's article on Deprecation of Exchange Web Services in Exchange Online.

Our current Cloud Archiving Service implementation uses EWS. To ensure continued compatibility and security, BCAS will align with Microsoft’s timeline and transition to Microsoft Graph-based APIs.

When the updated implementation rolls out in 2026, existing BCAS customers will be prompted to reauthorize their Exchange Online source. Reauthorization is a standard security step when transitioning to new API integrations. For step-by-step instructions on granting tenant-wide admin consent in Microsoft 365, see How to Approve Microsoft Graph Permissions for Barracuda Cloud Archiving Service.

• Will BCAS stop working after EWS is retired?
  No. Barracuda Networks is migrating BCAS to Microsoft Graph APIs to ensure uninterrupted service after EWS is retired. You will simply need to reauthorize your Exchange Online source when prompted.

• Do I need to do anything now?
  No immediate action is required until you are prompted within BCAS to update your integration. When ready, refer to How to Approve Microsoft Graph Permissions for Barracuda Cloud Archiving Service for instructions on granting the required Microsoft Entra ID permissions.

• When will the migration occur?
  The migration is aligned with Microsoft’s timeline and will roll out in 2026, ahead of the EWS deprecation deadline.