Hello, I had the same problem on i386 (Version 1.5.9-2).
The following in my .muttrc helped:
set imap_authenticators = "gssapi:cram-md5:login"
Now I can connect to the Exchange server just fine.
Best regards
Uwe
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Uwe Zeisberger
http://www.google.com/search?q=sine+of+%2830+degree%29
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