I’m frustrated

Where are my sent messages? (sent folder at 4GB)

I'm running Windows XP and recently updated to Thunderbird 3.1.2 Suddenly I can't access my "Sent" email folder. When I click on it I get a screen headed SENT MAIL with the choices Email, Accounts, and Advanced Features. If I click on Read messages it takes me back to my In Box. If I click on sent again and wait a long time (several minutes) my Sent folder may appear but it hasn't been storing my sent emails since August 25. I tried deleting some old emails (in case it was out of space), compacting the files, rebooting the computer, etc. Nothing helps. Can you? Jim
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