With constantly growing email content, users need to carefully handle the amount of storage used by their mailbox. For Microsoft Exchange/Outlook users, this normally involves routine archiving of email. However some users experience problems after archiving emails where Outlook still shows the mailbox is full. The user will eventually reach their storage limit and are no longer able to send/receive further email due to the administrative limits.
The problem can occur when there are too many sync issues and conflicts causing the server to not properly sync with the Outlook email client. After 'archiving', the mailbox still shows FULL and server data size does not decrease.
Solution # 1
1.) Click the folder icon as shown below to show the Sync Issues Folder
2.) Delete all the logs, messages and info inside these 3 folders (Conflicts, Local Failures and Server Failures). This is to allow to freshly download all the emails from Exchange Server to Email client (outlook).
3.) Click the button Send / Receive All Folders.
4.) If the mailbox shows full, do an Archive. (and by right it should update the server data size as well).
Solution # 2
1.) Right Click on the folder (which you believe that you already archived the folder) then click Properties. e.g. Inbox
2.) Click Clear Offline Items and then click OK
3.) Click the Send/Receive Tab
4.) Click Update Folder. This will force to re-download the email from the server.