I recently upgraded Mac os 10.5.6 to the new 10.8.1 (Mountain Lion). So far, everything seems to work fine except Mail.app. When I open the application for the first time, it begins migrating and then freezes. How can I solve this?

  • FYI) My old OS was 10.6.8... Commented Sep 5, 2012 at 14:26
  • 1
    So, its 10.5.6 or 10.6.8?
    – Thecafremo
    Commented Sep 6, 2012 at 10:54

1 Answer 1


Try deleting the three files which name start with Envelope, in ~/Library/Mail/V2/MailData .

  • 1
    This is a common problem. The directories you need to delete are cache files and it is safe to delete them. However, if I recall, they are in hidden directories, so you need to know how to enable invisible directories and files in the Finder to find them and delete them.
    – user9290
    Commented Aug 14, 2013 at 12:18

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