1. Shut down Outlook 2007, then rename (or delete) the following files:
„C:\…\AppData\Local\Microsoft\Outlook\extend.dat” [to extend.old]
„C:\…\AppData\Local\Microsoft\FORMS\FRMCACHE.dat” [to frmCache.old]
Restart Outlook 2007 and this will fix it for a lot of people, including mine. For those that it does not solve this issue, and you have google desktop…
2. Uninstall Google Desktop. Microsoft doesn’t know how this could work, but it does.
If that leaves anybody else, go to Mozilla and download their email client „Thunderbird” and get on with life, its not worth your time.