Mailbox Size Exceeds Limit

Mailbox Size Exceeds Limit

I'm receiving the following error on a user's mailbox:

"User : caroline.olavarrieta@gametheory.joburg

Details :MailBox Size Exceeds Limit [MailBox Size=2,390]. Mail Fetch has also been disabled for any active POP accounts."

She has a limit of 5GB. Please let me know what the issue could be.

Thanks.

Kevin