When the University migrated employee email addresses over to Office 365, user's saw a substantial increase (from 2 - 4GB to 100 GB) in the storage capacity of their email accounts. With this increase in storage space, the need to create email archives in greatly reduced. It is also important to note that you will not be able to access any emails you archive from the online Office 365 mail portal.
If you are unsure about whether or not you should create an email archive, please contact the OIT Support Center.