Microsoft Office 365 Mailbox storage limits
Microsoft Office 365 Exchange Online limits More Info
The amount of mailbox storage available is determined by the mailbox type and the user’s subscription license. Administrators can reduce maximum mailbox sizes per user or globally.
| Note: |
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| Using journaling, transport rules, or auto-forwarding rules to copy messages to an Exchange Online mailbox for the purposes of archiving is not permitted. A user’s archive mailbox is intended for just that user. Microsoft reserves the right to deny unlimited archiving in instances where a user’s archive mailbox is used to store archive data for other users. |
Note:Feature | Office 365 Business Essentials | Office 365 Business Premium | Office 365 Enterprise E1 | Office 365 Enterprise E3 | Office 365 Enterprise E5 | Office 365 Enterprise F1 |
User mailboxes | 50 GB | 50 GB | 50 GB | 100 GB | 100 GB | 2 GB |
Archive mailboxes7, 8 | 50 GB | 50 GB | 50 GB | Unlimited1 | Unlimited1 | Not available4 |
Shared mailboxes | 50 GB2 | 50 GB2 | 50 GB2 | 50 GB2,9 | 50 GB2,9 | 50 GB2 |
Resource mailboxes | 50 GB3 | 50 GB3 | 50 GB3 | 50 GB3,9 | 50 GB3,9 | 50 GB3 |
Site mailboxes5 | 50 GB | 50 GB | 50 GB | 50 GB | 50 GB | Not available |
Public folder mailboxes | 50 GB6 | 50 GB6 | 50 GB6 | 100 GB6 | 100 GB6 | Not available |
Group mailboxes | 50 GB | 50 GB | 50 GB | 50 GB | 50 GB | 50 GB |
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