ICal won't work with internal address to exchange server; mysteriously reverts to internal address

iCal will not sync to our exchange server via our internal address. It WILL sync if I copy the external address into the internal field, but after a few days, the internal address mysteriously reappears and the sync is broken. Please help!
OS 10.7.5
iCal 5.0.3
Exchange 2010

Your problem seems similar to this thread:
http://discussions.apple.com/thread.jspa?threadID=1992033&tstart=0
There is some contradictory anecdotal information there, however. Tis reply in another thread:
http://discussions.apple.com/message.jspa?messageID=6288712#6288712
may hold some answers to your problem. There are two very enlightening articles on AFP548.com regarding certificate issues:
http://www.afp548.com/article.php?story=20080624005724638
http://www.afp548.com/article.php?story=20071203011158936
That might also be of assistance. Then there's this little tidbit:
http://www.networkjack.info/blog/2007/11/30/ssl-cert-with-subject-alternate-name /
These may-or-may-not solve theproblem but may provide insight as to why it's happening.

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