Mailbox and Message Size Limits
Mailbox Quotas
The quota for Office 365 mailboxes is set to 100 gigabytes (GB). Office 365 Archive Mailboxes are available for users requiring more than 100GB worth of 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.
