If your email is over quota then you need to do your best to make space for more on our servers. Often it is not enough to select old emails for deletion in order to clear space, many times these emails are just moved to a separate folder within the email account, not actually being deleted until a set time after they've been moved to that "Deleted Items" folder. Another common issue is your email account within Outlook or any other mail program may not be set up to delete messages from the server even if you select to delete them.
Please select from the following articles below for the relevant instructions for each email program:
- Outlook 2010/2013/2016
- Outlook 2007
- Mac Mail