Contacts Duplicating on Outlook 2007 w/exchange server

We have a user that has 6500 contacts in outlook 2007, last week his contacts started duplicating. We have tried new profiles, we are thinking its outlook. Any ideas?
CrestComputerGuysAsked:
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Neil RussellTechnical Development LeadCommented:
Does he sync an external PDA or mobile? This is normally the cause of such issues
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CrestComputerGuysAuthor Commented:
Yes, Blackberry, it has been removed. the issue only seems to happen when you open outlook
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