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Will Changing Exchange Online Archive Policy Delete Existing Messages?
Question details
The user wants to know if changing an Exchange Online archive policy to a one-year retention period will result in the deletion of messages already stored in the archive.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Modifying a Message Records Management (MRM) retention policy for a shared mailbox with existing archived emails.
- Observed behavior
- The user needs to safely archive older messages automatically without risking the permanent deletion of the 40 GB of emails already residing in the online archive.
Verify your current Microsoft 365 licensing to ensure your shared mailbox has the appropriate Exchange Online Plan 2 license if it requires more than 50 GB of storage or unlimited archiving.
Use the Move to Archive Retention Action
Configure your retention tags with the Move to Archive action to ensure messages are preserved in the online archive rather than being deleted.
Exchange Online retention tags provide different actions for aging items. To safely retain your messages without risking accidental deletion, you must explicitly choose the archiving action over any deletion actions. This ensures compliance while maintaining email history.
Log in to the Microsoft 365 Exchange admin center or Microsoft Purview compliance portal using your administrator credentials.
Go to Compliance management and select Retention tags from the available menu options.
Create or edit a personal or default retention tag and ensure the Retention action is explicitly set to 'Move to Archive' instead of 'Delete and Allow Recovery'.
Add this newly configured tag to your Message Records Management (MRM) retention policy and apply it to the designated shared mailbox.
Verify Shared Mailbox Licensing and Enable Archive
Ensure the shared mailbox has the correct licensing and that the online archive feature is enabled before applying retention policies.
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Frequently Asked Questions
How much storage does an Exchange Online shared mailbox get by default?
A shared mailbox in Exchange Online typically includes 50 GB of storage by default without a license. To increase this capacity to 100 GB and enable an online archive, an Exchange Online Plan 2 license must be assigned to it.
What is the difference between deleting and archiving in Exchange retention tags?
The 'Move to Archive' action shifts messages from the primary mailbox to a separate archive mailbox to free up space. In contrast, 'Delete and Allow Recovery' or 'Permanently Delete' actions will remove the messages from the mailbox entirely.
Will a new retention policy retroactively delete my existing archived emails?
No. As long as your new policy uses a 'Move to Archive' action, it will simply process existing items in the primary mailbox and move qualifying emails to the archive, leaving your already archived messages safely intact.
