Mail (OS 10.8.2) hangs and spins continually. have to force quit and restart.

Question

I stopped using Outlook (Office for Mac) on my MacAir because it would hang and spin.  But Mail is doing it too.  I used to have four accounts attached (icloud, entourage, outlook, gmail) but took off gmail and outlook and now have only entourage and icloud.  Hasn't made any difference. 
Suggestions? 
jeanne

Answer 1

Please follow these instructions to delete the Mail "sandbox" folder.
Back up all data.
Triple-click the line below to select it, then copy it to the Clipboard (command-C):
~/Library/Containers/com.apple.mail
Quit Mail.
In the Finder, select Go ▹ Go to Folder from the menu bar. Paste (command-V) into the box that opens, then press return. A Finder window should open with a folder named "com.apple.mail" selected. If it does, move the selected  folder — not just its contents — to the Trash.
Relaunch Mail and test.
Caution: If you change any of the contents of the sandbox, but leave the folder itself in place, Mail may crash or not launch at all. Deleting the whole sandbox will cause it to be rebuilt automatically.