This has since been fixed. See the reply for the solution! I tried out ML, didn't like it (in fact, hated it) so I rolled back to 10.7.3. Now, Mail.app won't start and I get this error: Pastebin Some people recommended a fresh reinstall, but this happens directly after formatting the hard drive and doing a fresh reinstall! I tried reinstalling iLife to no avail. It won't let me reinstall a previous version of Mail. Any help? *UPDATE* I tried a "dirty" install of Lion. No luck. I also noticed some of the prefpanes aren't working. They are: Desktop & Screen Saver Spotlight Energy Saver I'll try playing around with OnyX to see if I can fix these issues. *UPDATE 2* OnyX can't do anything about it. Meanwhile, this thread describes the same problem verbatim. I guess the OP is too scared to admit installing a pirated version of ML DP.