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To work with these issues, the best way is to use the server and client logfiles (Windows Event Log & Communicator logfiles) In cases of Presence Unknown for External Contact, both federated and Public IM, the problems is often related to DNS name resolution issues.
Again i can recommend to use the logfiles availible.
The second half of the server-side process is controlled by the Address Book Service which pulls information from the SQL database and writes the changes to the address book files.
The overall process is basically the same as what Office Communications Server does, but with added flexibility of easily customizing some of the timing of the different events.The entire process happens over time based on a number of intervals, and by default looks like this: value indicates the default behavior of Lync Server to search Active Directory for any changes every minute.This interval is 1 minute by default and can be customized to any value between 1 second and 24 hours.Now only available for US customers, but expected to be expanded outside of the US later this year.to internal server issues, or non existing (non UC enabled) users.
Related articles: Troubleshooting with Office Communicator 2007 Logs IM and Private domains: post any comment below, also if you have relevant problems.