Address Book synchronization may occur two times when many clients connect to a computer that is running Communications Server 2007

You have a computer that is running Microsoft Office Communications Server 2007. When many clients connect to this computer, Address Book synchronization may occur two times. Additionally, the following message is logged in the Application log two times on the same day:

Event Type: Information
Event Source: OCS Address Book Server
Event Category: (1008)
Event ID: 21004
Date: <Date>
Time: <Time>
User: N/A
Computer: <server>

Description: Next synchronization pass will start at: <Date> <Time> For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

This problem occurs because of a logic issue in the ABServer.exe managed assembly.

How to obtain the hotfix

This issue is fixed in the Communications Server 2007 hotfix package that was released in June 2007. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.