How to Enable Auto-Expanding Archive for a Microsoft 365 Mailbox
Question details
The user needs to enable auto-expanding archiving for a Microsoft 365 mailbox to automatically allocate additional storage space.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- A Microsoft 365 archive mailbox is approaching or has reached its initial storage quota, and the administrator wants to prevent the mailbox from running out of space.
- Observed behavior
- The standard archive mailbox hits its capacity limit even if the primary mailbox has space available. By enabling the feature, the archive automatically expands in increments up to a total of 1.5 TB.
Ensure you have the necessary administrative privileges (such as Global Administrator or Exchange Administrator) and verify that the mailbox is assigned an eligible Exchange Online or Microsoft 365 license before proceeding.
Enable Auto-Expanding Archiving via Exchange Online PowerShell
Use Exchange Online PowerShell to quickly enable the auto-expanding archiving feature for either your entire organization or specific user mailboxes.
Once auto-expanding archiving is turned on, Microsoft 365 automatically provisions additional storage when the archive mailbox approaches its limit, reducing manual administrative overhead.
Launch PowerShell on your computer as an administrator and connect to Exchange Online using your Microsoft 365 administrator credentials.
To turn on auto-expanding archiving for all eligible mailboxes in your organization, type and execute the command: Set-OrganizationConfig -AutoExpandingArchive.
If you prefer to enable the feature only for a specific user, type and execute the command: Enable-Mailbox <user_email> -AutoExpandingArchive, replacing <user_email> with the target user's email address.
Check the Microsoft Purview compliance portal or run a mailbox statistics command to confirm that the auto-expanding archive state has been successfully updated.
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While Microsoft 365 handles your complex server-side email archiving, you may be looking for a lightweight, cost-effective solution for everyday document editing. WPS Office is a highly compatible, free Office alternative that fulfills all your document, spreadsheet, and presentation needs.
- 1. Download the Installer: Visit the official WPS Office website and download the free installation package for your operating system.
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Frequently Asked Questions
What is the maximum storage limit for a Microsoft 365 auto-expanding archive?
Once auto-expanding archiving is successfully enabled, the archive mailbox storage can automatically increase in increments up to a maximum total of 1.5 TB of additional space.
Why did my archive mailbox fill up if my primary mailbox still has space?
In Microsoft 365, the primary mailbox and the archive mailbox maintain completely separate storage quotas. Even if your primary inbox is mostly empty, the archive can hit its initial quota, requiring auto-expanding archiving to be enabled.
Do I need a special license for auto-expanding archiving?
Yes, auto-expanding archiving is a premium compliance feature that generally requires specific enterprise subscriptions, such as an Exchange Online Plan 2 or Microsoft 365 E3/E5 license. Check your admin center to confirm license eligibility.
