I have a user who cannot search contacts in the OCS 2007 client. I have cleared the address book files as well as reinstalled the program. He can log into OCS from another machine and search contacts without issue, so I'm led to believe it is something locally on the machine and not with his account. We are using OCS 2007 R2 on Windows XP SP3. We also use OCS for the BB and he is able to search contacts via the BB. We have disabled his account on the server and re-enabled it, but still he cannot search contacts. He does receive an error that OCS cannot sync with the Outlook Address book, but I have rebuilt the Outlook profile and rebuilt the OAB. Any help would be appreciated.