Infrastructure Requirements

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.

Before you prepare Active Directory for Office Communications Server 2007, ensure that your Active Directory infrastructure meets the following prerequisites:

• Domain controllers run Microsoft Windows® 2000 Server SP4 (Service Pack 4), Microsoft Windows Server® 2003 SP1, or Windows Server 2003 R2 or later operating systems. (Windows Server 2003 R2 is recommended).

• Global catalog servers run Windows 2000 Server SP4, Windows Server 2003 SP1, or Windows Server 2003 R2 or later. (Windows Server 2003 R2 is recommended).

• All domains in which you deploy Office Communications Server use Windows 2000 Server native mode or later operating system. You cannot deploy Office Communications Server in a mixed mode domain.

  Office Communications Server 2007 supports the native mode universal groups in the Microsoft Windows Server 2003 and Windows 2000 Server operating systems. Members of universal groups can include other groups and accounts from any domain in the domain tree or forest and can be assigned permissions in any domain in the domain tree or forest. Universal group support, combined with administrator delegation, simplifies managing an Office Communications Server 2007 deployment. For example, it is no longer necessary to add one domain to another to enable an administrator to manage both. Eliminating the domain-add requirement also simplifies deployment.

  Note

  To change your domain to run in Windows 2000 native mode or later operating system, see "How to raise domain and forest functional levels" at https://support.microsoft.com/en-us/kb/322692.