How much mailbox storage is included in Microsoft 365 Business Premium?

Question

I'm interested how much mail storage (primary and archive) is included in Microsoft 365 Business Premium subscription!

Answer 1

Hi Davor Malezija,

Thank you for posting your question in the Microsoft Q&A forum and for your question regarding the mail storage included with the Microsoft 365 Business Premium subscription.

Based on Microsoft’s official documentation on Exchange Online limits, here’s a breakdown of the mailbox storage limits associated with this plan:

Primary Mailbox Storage
Each user is allocated up to 50 GB of storage for their primary mailbox under Exchange Online.

Archive Mailbox Storage
Users also receive up to 50 GB of archive mailbox storage. However, this limit can become effectively unlimited if auto-expanding archiving is enabled.

Note: Auto-expanding archiving is supported in Microsoft 365 Business Premium, but it must be manually enabled by an administrator.

Additional Considerations

• These limits are governed by Exchange Online, which powers the email service in Microsoft 365.
• If a user reaches the primary mailbox quota, they’ll need to either delete emails or utilize the archive mailbox.
• The archive mailbox is not enabled by default—it must be configured through the Exchange Admin Center.

I hope this helps clarify the storage capacities available with your subscription. If you need guidance on enabling archiving or managing mailbox quotas, feel free to ask!

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