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mediumExchangeExchange Onlineupdatelearn_exchange · Jun 25, 2025

Increase or customize Exchange Online mailbox size - Exchange

Tenant administrators can now increase or customize Exchange Online mailbox sizes by assigning different subscription licenses to users who run out of storage space. This change does not apply to Microsoft 365 Government tenants.

Increase or customize Exchange Online mailbox size Original KB number: 2490230 As a tenant administrator, if one of your users runs out of storage space in their Exchange Online mailbox, and they want to increase its size, you'll have to assign a different subscription license to them. This feature isn't available fo…
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Audience
admin
Environment
cloud
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Increase or customize Exchange Online mailbox size - Exchange | 365Forge