microsoft echange account does not have permission to sync

I'm getting the following error on one of my user accounts.
"Your Microsoft Exchange Server account does not have permission to synchronize with your current settings.  Contact your Exchange Server administrator".  Well I'm the server admin and can't find anything different between this account and my accounts(works fine on same phone).
Same mobile activesync policy.  Also this user account has no phones currently registered on his account.

Any ideas?  Exchange, Exchange over HTTP, IMAP all work fine for this user also.
casitAsked:
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eldiosCommented:
Check to make sure that the user account in Active Directory has the proper permissions for its mailbox.  Open the user object and click 'Exchange Advanced' tab, then click 'Mailbox Rights'.  Find the SELF account and make sure that it is given the 'Associated External Account' right.
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