Microsoft 365 Retention Policies – Technical Troubleshooting Overview

Retention policies in Microsoft 365 are managed through Microsoft Purview and enforced by workload-level processes such as Exchange Managed Folder Assistant and SharePoint Online timer jobs. These policies apply at the individual item level rather than the mailbox level.

Retention Enforcement Priority

1. eDiscovery or Litigation Holds

2. Retention Labels

3. Retention Policies

4. User-Initiated Deletion

Higher-priority controls always override lower ones and prevent deletion.

Quick Troubleshooting Checklist

• Confirm policy scope and applied rules

• Review hidden holds such as Litigation Hold or eDiscovery cases

• Verify retention action settings (retain or delete)

• Manually trigger Managed Folder Assistant using PowerShell:
  Start-ManagedFolderAssistant user@domain.com

• Allow 24–48 hours for policy synchronization and enforcement

Key Takeaway
When data is not being deleted, it is most often expected behavior due to retention configuration rather than a system fault.

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