Mail appears open in dock but nothing on screen! Help!

I have this bizarre problem where i go to open my mail on my imac, i click the app in the dock, it bounces once, then the black arrow next to it appears. But nothing appears on screen. No windows, no error messages, nothing. But i do get the Mail bar at the top of the screen with 'File', 'Edit','View' etc etc.
This has never happened before. I have tried opening Mail from the App folder, restarted my computer 6 times, repaired disk permissions, but still no joy.
Anyone have any idea of what may be the problem may be, would be very much appreciated.
Thankyou
Matt

Ok try the "Rebuild" command under the "Mailbox" menu. Failing this it may be a good idea to backup your mailboxes, reinstall Mail from your system disk, update and re-import your mailboxes.
Let me know how it goes

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