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Illinois State University

What is the Attachment Size Limit in Office 365?

By default, the attachment size limit in Office 365 is 50 MB. If you need to send a file via email that is larger than 50 MB, you will need to use a different method, such as a listserv or the SendTo application, in order to send the message.


For more information about these options, please refer to:





For More Information About Office 365, please refer to:





How to Get Help


For technical assistance, you may contact the Technology Support Center at (309) 438-4357, or by email at