Forum Discussion
Primary Mailbox Quota Increases to 100 GB for Microsoft 365 Business Plans
Microsoft announced details about how they will deploy the 100 GB mailbox quota to Microsoft 365 Business tenants. A new service plan is being deployed to tenants to liberate the additional 50 GB of quota. Having a larger mailbox quota delivers a fantastic opportunity to fill a mailbox with all sorts of digital debris, something that can cause problems in the era of AI. Perhaps enabling mailbox archiving for Business tenants to allow them to clear out old mailbox items would have been better?
https://office365itpros.com/2026/08/21/100-gb-mailbox-quota-m365-business/
1 Reply
Great improvement for Microsoft 365 Business plans, but more mailbox storage shouldn't replace a proper data lifecycle strategy.
From an Exchange Online administration perspective, I'd still prefer organizations to combine the additional capacity with Online Archive, retention policies, and regular mailbox governance rather than simply allowing primary mailboxes to grow indefinitely.
With Copilot and AI increasingly consuming organizational data, keeping 100 GB of email doesn't necessarily mean keeping 100 GB of relevant information.
More storage solves the quota problem. Good governance solves the data problem.
