Mailbox and Message Size Limits
Mailbox Quotas
The quota for Office 365 mailboxes is set to 5 gigabytes (GB). Office 365 Archive Mailboxes are available for users requiring more mailbox space.
Message and Attachment Size Limits
Limits on message and e-mail attachment are set to the maximum allowed by Office 365. Please refer to Office 365 Message Limits for more information - CSU's Office 365 tenant is subject to the same limitations noted for the Office 365 Enterprise versions listed. Note that message limits vary with the e-mail client (Outlook for Windows, Outlook for Mac, OWA, etc.) used. Also, restrictions may be enforced on recipient e-mail systems (external to Office 365) that prevent delivery when exceeded.
