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description: This article provides troubleshooting steps for the recent known issues with Windows 365 disaster recovery
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ms.reviewer: kaushika; aradinger
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description: Learn about known issues that involve Windows 365 disaster recovery, including workarounds and updated fixes.
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ms.reviewer: kaushika; aradinger; v-appelgatet
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ms.date: 10/16/2025
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ms.topic: troubleshooting-known-issue
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ms.service: windows-365
@@ -11,22 +11,22 @@ ms.custom:
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# Windows 365 BCDR known issues
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## Summary
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This article addresses a known issue that's related to Windows 365 Business Continuity and Disaster Recovery (BCDR) scenarios.
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## Classic Outlook is corrupted after disaster recovery failback and failover
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## Classic Outlook is corrupted after disaster recovery failover or failback
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After you restore a Cloud PC from a snapshot during a disaster recovery failover or upon failing back to the primary region after the disaster, users might encounter an error message when they start classic Outlook.
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This issue occurs when the Outlook offline cache becomes corrupted after restoring a Cloud PC from a snapshot during a disaster recovery failover or upon failing back to the primary region post-disaster. Users may encounter an error message when starting Outlook.
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This issue occurs because the Outlook offline cache becomes corrupted because the client and the server become out of sync during a failover. The client on the snapshot reflects a past state relative to the server's current status. The process of re-synchronizing the Offline Storage Table (OST) file can take time.
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The root cause lies in the synchronization process between the client and server. During a failover, the client and server become out of sync because the client on the snapshot reflects a past state relative to the server's current status. Although no data is lost, the process of re-synchronizing the Offline Storage Table (OST) file can take time.
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This process does not cause any data loss.
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### Workaround
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After you complete a failover or failback operation, delete the Cloud PC's OST file.
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After you complete a failover or failback operation, delete the Cloud PC's OST file.
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This action forces Outlook to rebuild the search index and the offline cache of the mailbox. No user data is lost during this process.
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This action forces Outlook to rebuild the search index and the offline cache of the mailbox. This process does not cause any data loss.
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### Resolution
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Switch to the new Outlook app. The new Outlook app uses a different caching mechanism that eliminates this synchronization issue.
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Use the new Outlook app. The new Outlook app uses a different caching mechanism that eliminates this synchronization issue.
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