Solution: Mail not opening after Lion install?

So you have installed Lion and imported your mail back from a TimeMachine backup you did in Snow Leopard. You click Mail and it updates/imports the messages and then… nothing. I got the menu bar at the top of the screen but no actual application window. Shit!

This is how I resolved the problem.

Assuming you still have the TimeMachine backup:

1. You’ll need to show the Library (hidden by default in Lion). To do this, launch Terminal (it’s in Applications, Utilities) and enter the following command:

   1	chflags nohidden ~/Library

2. Now you can see the Library folder under your username, move the ‘Mail’ folder from your-username/Library/ to the Desktop (or somewhere else, does’t matter where).
3. Launch Mail again, it will now load (honest) but you will be forced to enter a mail account details. Once you have done that, the Mail window will open (I know, about friggin’ time, right).
4. Now, with Mail running, you can either enter TimeMachine, select the folders that were there in Snow Leopard and click Restore. Or, from the Mail menubar, click File, then Import Mailboxes and then choose the ‘Apple Mail’ option and then browse to the Mail folder on your Desktop (or wherever you saved it), and then import all the mailboxes it finds.

Hope this helps I have been searching for a long time for this solution. Just thankfull I can now read my emails!