Outlook Mailbox Size Limit and Management

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Each UWSP student, employee, and shared department mailbox has a size limit of 100 GB.

Every folder (e.g. Sent Items, Deleted Items, Drafts, etc) and each sub folder that you create has its own folder size which counts against the total file size for your mailbox. Attachments, in particular large data files and images, can contribute significantly to your mailbox size.

The UWSP email system will automatically send out email notifications when your mailbox is approaching capacity.  If you exceed the mailbox limit, you will be unable to send messages until you reduce the size of your mailbox.  You will only be able to receive incoming messages.  

Tips to Reduce Your Mailbox Size

  • Delete unneeded emails with large file sizes.
     
  • Save large email attachments to your OneDrive or shared server space, then remove them from their email, or delete the email with its attachment.
     
  • Delete old repetitive emails. For example: Campus Announcements, other news related emails, vendor emails, etc).
     
  • Review and Empty your Junk Email folder: You should regularly review your Junk Email folder. If an email is incorrectly routed as Junk, report it as Not Junk so that future emails from the sender display in your Inbox. 
    • To empty your Junk Email folder, right-click the folder and select Empty Folder. This sends your accumulated junk email to your Deleted Items folder.
       
  • Right click your Delete Items folder and select Empty Folder.
     
  • Use a shared mailbox for department or organization related correspondence instead of your personal UWSP mailbox.   Keeping department or organization email separate from your personal UWSP email is a very effective way to slow the accumulation of email in your mailbox.

For other mailbox clean up tips see Microsoft's support article, Manage My Mailbox Size in Outlook.

 

Contact the IT Service Desk with additional questions!

Details

Details

Article ID: 4045
Created
Fri 6/13/25 1:47 PM
Modified
Thu 9/11/25 1:55 PM