As of February 2014 Myhosting.com has instated a mailbox size quota within the classic email system (pop3/imap). This quota has been set to 4GB maximum size.
Most of the mailboxes large size is due to the mailbox archiving system within the classic environment. The steps below will show you howto subscribe to the folders, download or delete them.
The easiest way to remove the folder (if the you do not need them) would be from the http://emailadmin.myhosting.com page. Once you have selected a user go to Mailboxes and delete the folder.
To subscribe to the folder