Office Communicator 2007 unable to sign in because of clock not set correctly

One user was having problem trying to sign into his Office Communicator.  He received the following error message when trying to sign in.

Cannot sign into Communicator because your computer clock is not set correctly. To check your computer clock settings, open Date and Time in Windows.

The date, time and time zone was all correctly set.  So what is the cause of it?  The culprit turned out to be the wrong setting of the W32Time synchronization type in the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\W32Time\Parameters registry key.

The Type was set to NoSync.  By changing it to NT5DS and reboot the machine solved the problem.

The article Registry entries for the W32Time service describes the different synchronization type.  One possible reason why this might have happened to his computer was that the Synchronize with an Internet time server in the Date and Time properties was unchecked before joining the computer to the AD domain.

Anyway, he is glad to be able to sign in again.