Outlook 2010 Mailbox Full – Your mailbox is full, you may not be able to send or receive mail
First Verify 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)