Understanding Email Deletion in Exchange Online
When users delete emails, they go to Deleted Items, then Recoverable Items, and finally are purged after 30 days (default retention).
Method 1: User Self-Recovery (Deleted Items)
Users can recover from Deleted Items themselves:
- Open Outlook
 - Go to Deleted Items folder
 - Right-click email ? Move ? Inbox
 
Method 2: Recover from Recoverable Items
If deleted from Deleted Items:
- In Outlook, go to Deleted Items folder
 - Click "Recover items deleted from this folder" (top menu)
 - Select emails ? Restore
 
Method 3: Admin Recovery Using PowerShell
Connect to Exchange Online and search for deleted items:
Connect-ExchangeOnline
Search-Mailbox -Identity "user@domain.com" -SearchDumpsterOnly -SearchQuery "subject:'Important Email'" -TargetMailbox "admin@domain.com" -TargetFolder "RecoveredEmails"
Method 4: eDiscovery Search (Best for Large Recoveries)
- Go to Microsoft 365 Compliance Center
 - eDiscovery ? Create new case
 - Add search ? Select mailbox
 - Define search criteria
 - Export results and restore to mailbox
 
Increase Retention Period
Extend deleted item retention from 30 to 60 days:
Set-Mailbox -Identity "user@domain.com" -RetainDeletedItemsFor 60
Prevention Tips
- Enable litigation hold for critical mailboxes
 - Train users on proper archiving
 - Implement retention policies
 - Regular backups with third-party tools
 
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