My Mail.app had a Bug

Hello Apple,
my Mail has an Bug. It works with one Exchange-Mailbox... but it dosn't work with more Exchange-Mailboxes... It does not synchronize the mailboxes...
I work with my Mac's and it really is very very annoying, this problem...
I'm really upset, especially with Lion everything worked.
My MacBook Pro runs with OS X 10.8.2 (12C60) with Mail 6.2 (1499)

Have you tried removing the email account from the app through settings?  I would try removing it, rebooting, opening the email app to see if it still crashes,  & then adding it back your email account. 
If you're leary about causing more issues while you're not home, you could always try using a third party mail app (there are many), accessing your email through it...not a fix for your problem but a way to deal with the situation until you can get it worked out.
Resetting all settings on the iPad (not deleting content) is a good way to clear many errors as it can remove leftover cache files & files that have become corrupt.
Sorry I couldn't be of more help.  Good luck & let us know if you get it working.

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