'%3e%3cpath%20d='M8%200C12.4183%200%2016%203.58172%2016%208C16%2012.4183%2012.4183%2016%208%2016C3.58172%2016%200%2012.4183%200%208C0%203.58172%203.58172%200%208%200ZM11.6162%204.38379C11.2257%203.99337%2010.5927%203.99338%2010.2021%204.38379L8%206.58594L5.79785%204.38379C5.40732%203.99334%204.77429%203.99329%204.38379%204.38379C3.99331%204.77429%203.99335%205.40733%204.38379%205.79785L6.58594%208L4.38379%2010.2021C3.99348%2010.5927%203.99341%2011.2257%204.38379%2011.6162C4.77426%2012.0066%205.40734%2012.0065%205.79785%2011.6162L8%209.41406L10.2021%2011.6162C10.5927%2012.0066%2011.2257%2012.0067%2011.6162%2011.6162C12.0067%2011.2257%2012.0066%2010.5927%2011.6162%2010.2021L9.41406%208L11.6162%205.79785C12.0066%205.40735%2012.0066%204.77429%2011.6162%204.38379Z'%20fill='%23080E17'%20fill-opacity='0.46'/%3e%3c/g%3e%3cdefs%3e%3cclipPath%20id='clip0_3761_713'%3e%3crect%20width='16'%20height='16'%20fill='white'/%3e%3c/clipPath%3e%3c/defs%3e%3c/svg%3e)
How to Expand Microsoft 365 Online Archive Storage
Question details
The user needs to expand the Microsoft 365 Online Archive storage limit to successfully migrate large mailboxes up to 1 TB in size.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Migrating a large mailbox where the archive mailbox storage limit has been reached, causing the migration to pause or fail because auto-expansion does not occur immediately.
- Observed behavior
- Auto-expanding archiving is enabled but delayed, halting the migration process. The user wants to manually force or speed up the expansion process.
Ensure you are logged into the Microsoft 365 admin center with global administrator privileges and have verified that the user is assigned a license supporting the Online Archive feature.
Run Archive Diagnostics and Confirm Auto-Expanding Configuration
Use the Microsoft 365 admin center diagnostic tools to check the status of the archive mailbox and ensure auto-expanding features are correctly configured.
Microsoft 365 auto-expanding archiving is designed to automatically provision additional storage space as needed. However, this process is not instantaneous and cannot usually be forced manually.
To ensure your environment is prepared to handle large migrations, you must verify the archive state and licensing through official diagnostic tools.
Open a web browser and navigate directly to the official diagnostic link provided by Microsoft: https://aka.ms/PillarArchiveMailbox. Log in with your Microsoft 365 global administrator credentials.
In the Microsoft 365 admin center, go to 'Users' > 'Active users'. Select the user whose mailbox is being migrated, click on the 'Licenses and apps' tab, and confirm they have an Exchange Online Plan 2 or Plan 1 with an Exchange Online Archiving add-on.
Open the Exchange admin center. Navigate to 'Recipients' > 'Mailboxes', select the specific user mailbox, and ensure that the 'In-Place Archive' or 'Online Archive' setting is toggled to 'Enabled'.
Consult the Microsoft Purview compliance portal documentation to double-check your auto-expanding archiving settings globally or at the mailbox level.
If the migration is highly time-sensitive (such as moving a 1 TB mailbox) and the expansion is delayed, open a service request in the Microsoft 365 admin center under the 'Support' tab. Note that Microsoft may still be unable to expand the archive manually on demand.
Need a Lightweight Alternative for Daily Document Tasks?
While resolving server-side archive limits requires Microsoft 365 admin tools, your daily document creation doesn't have to rely on heavy, expensive software. WPS Office offers a streamlined, highly compatible office suite designed for maximum productivity without the hefty subscription fees.
Frequently Asked Questions
Can Microsoft Support manually expand my archive storage on demand?
Generally, no. Auto-expanding archiving is an automated backend process. While you can contact Microsoft 365 support for time-sensitive migrations, manual on-demand expansion is not a standard service offering and is rarely accommodated.
How long does auto-expanding archiving take to add more space?
Once the initial archive mailbox quota is nearing its limit, it can take up to 30 days for the auto-expanding archiving feature to fully provision the additional storage space.
Why did my large mailbox migration fail?
Migrations often fail when the target archive mailbox reaches its current storage capacity before auto-expansion has had enough time to trigger and allocate more space. It is highly recommended to monitor the storage and pause the migration until the expanded space is visible.
Do I need a specific license for auto-expanding archiving?
Yes. Users must have a qualifying license, such as an Exchange Online Plan 2 license, or an Exchange Online Plan 1 license bundled with an Exchange Online Archiving add-on, to utilize the auto-expanding archiving feature.
