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

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FYI) My old OS was 10.6.8... – Dan Roberts Sep 5 '12 at 14:26
So, its 10.5.6 or 10.6.8? – Thecafremo Sep 6 '12 at 10:54

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

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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 Aug 14 '13 at 12:18

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