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the connection to microsoft exchange is unavailable outlook 2013 outlook must be online address book

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Last Modified: 2015-03-03
I am getting the following error when opening the address book in outlook 2013:
the connection to microsoft exchange is unavailable outlook 2013 outlook must be online address book
I am all out of patience for this problem.   I get this message on SOME of the computers on our LAN and other do not.  When a user clicks on the address book, this error pops up.  They are using office 2013 and I already tried taking off cache mode and putting it back on.  That doesn't work.  Is there any way to resolve this problem.  It perplexes me because not everyone has this problem

The firewall being used is Symantec Endpoint Security.

Our mailserver is Exchange
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