I have just built a new PC for my parents. It is a Celeron 1.8ghz, 4GB RAM, with Windows 7 64bit.
I installed AVG, office 2003, and the latest Firefox. They all worked fine. Then I installed Thunderbird 3.0.4 and it started acting quite sluggish. I checked the resource monitor, and TB was using 100% CPU. I know there have been issues with IMAP accounts causing this, however it is a POP account that I have setup (iHug/VF). I then removed the account, and still the same. Even a re-install didn't change anything.
At the moment I am setting up windows live email client, however I would prefer TB. Any suggestions as to what is going on? I can't find any answers on google or bugzilla.