When you start Outlook 2010, you may get the error “"Mailbox Full – Your mailbox is full, you may not be able to send or receive mail”. This may be a false notification, as it appears to a bug in Outlook 2010 when you’re running in Outlook Cached Mode.
To make sure that your mailbox is not full, you can do 1 of the following things:
- Run “Get-MailboxStatistics alias | fl StorageLimitStatus” on your Exchange server in the Exchange Management Shell
- Log on to OWA and hover your mouse on your name in the left upper corner. A window will appear that tells you your mailbox current size and its maximum size.
- Log on to the server. In the Recipients Configuration, check the current mailbox size of the user, and check the quota limit (tab Mailbox settings –> Storage quotas)
Once you’ve verified that your mailbox is NOT full (so the full mailbox notification is incorrect), you should do the following:
- Open Outlook, click File (left top), Click Account Settings, double click your account name, and then uncheck “Use Cached Exchange Mode” and finish the wizard
- Close Outlook. Delete your OST file. The default location for you OST-file on Windows 7 is C:\Users\user\AppData\Local\Microsoft\Outlook\. Either copy and paste the path in Windows Explorer, OR Enable Hidden Folders to view the AppData folder.
- Open Outlook again and enable Cached Exchange Mode again (like you did in step 1, but now recheck)