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There are several ways to address this. While the mailbox size can be increased, there is a technical limit (Microsoft Outlook limit) so here are a few additional ideas:
Note: To create space in Outlook/Exchange, archive to an X:\ or G:\ drive. Archiving to C:\ will not free up any space.
You can save files to the X-Drive, but storage space is limited and only accessible on campus or using VPN. Google is FERPA compliant, for decisions where to store. File Storage and Sharing Options: Google Drive vs. X-Drive vs. OneDrive
TWU offers several instant messaging tools which can be used as alternatives to email. See Instant Messaging (Google Chat and RingCentral)