BigBoss has written a nice article that gives a lot of 2.0/2.0.1 troubleshooting hints and tips. Below is a snippet of the article.
Many comments on various issues in 2.0 or 2.0.1 upgrades. Many questions have been answered numerous times. I am adding a summary of a lot of the problems and solutions in this post for reference. I can also update it over time if we need it.
Problem: Mail App crashes after my update.
Solution: This is caused by the sync of the backup from iTunes. The permissions on the mail folder are incorrect (it’s owned by root). The easiest fix is to run bossprefs, click more, and click “fix user dir permissions”. You may need to reboot.
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