Storage of Global Active Directory Settings
Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.
For performance reasons, we recommend that you move the Office Communications Server Global Settings to the Configuration container in the Active Directory Domain Services. You must take this action prior to any other 2007 R2 release install action. If you do not take this step now, you will not be able to take it after you begin deploying Office Communications Server 2007 R2. For details see Move Global Settings.