Guide
How to recover deleted email in Microsoft 365
Deleted mail in Microsoft 365 is not gone immediately. It moves through Deleted Items, then to a hidden Recoverable Items folder, and stays there for a retention period — 14 days by default, configurable up to 30. Recovery is straightforward if you act within that window.
What you'll see
- A message or folder is missing from Outlook and is not in Deleted Items
- A user emptied Deleted Items and then realised something important was in there
- An entire folder disappeared after a drag on a touchpad or a mobile mis-tap
The procedure
Step by step
Step 01
Check Deleted Items first
In Outlook, open the Deleted Items folder and sort by date. Most reported losses are here. Drag the item back to its original folder rather than using Move, so the read state is preserved.
Step 02
Use Recover items recently removed from this folder
With Deleted Items selected, choose Recover items recently removed from this folder — in Outlook on the web this appears at the top of the message list. This exposes the Recoverable Items store and covers anything hard-deleted with Shift+Delete.
Step 03
Search the recoverable store precisely
Filter by sender, subject fragment or date rather than scrolling. Select the items, choose Restore, and they return to the folder they were deleted from — not to the inbox, which is a frequent source of "it didn't work" follow-ups.
Step 04
Extend the retention window if you are close to the limit
An admin can raise the deleted item retention on a mailbox from 14 to 30 days using the Exchange Online PowerShell command Set-Mailbox with RetainDeletedItemsFor. Do this before the deadline passes, not after — it is not retroactive.
Step 05
For items past the window, use eDiscovery or a backup
If retention has expired, a content search in Microsoft Purview can still surface items held under a litigation or retention hold. Without a hold, only a third-party backup product will have a copy. Microsoft 365's native retention is not a backup.
Step 06
Prevent the repeat
Apply a retention policy so business-critical mailboxes keep items longer, and consider a third-party backup if losing 30-day-old mail would genuinely hurt. Tell the affected user which folder the items were restored to.
When to stop and escalate
Escalate if mail is disappearing without anyone deleting it. That usually means a rogue inbox rule, a misconfigured mobile client, or a compromised account moving evidence out of sight — investigate the rules and sign-in logs before restoring anything.
How AlwaysOnIT handles it
AlwaysOnIT runs this recovery inside chat: the agent identifies the mailbox, searches the recoverable store, restores the matching items and confirms the count restored, without you needing to open a PowerShell session.
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