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Windows server 2003 SP2
window server 2003
1. Windows 2000 mixed mode 2. Windows 2000 native mode 3. windows 2003 server
Considerations when Installing a new Windows Server 2008 forestWhen you install AD to create the first domain controller in a new Windows Server 2008 forest, you must keep the following considerations in mind: You must make forest and domain functional level decisions that determine whether your forest and domain can contain domain controllers that run Windows 2000 Server, Windows Server 2003, or both. To read more about forest and domain functional levels please refer to the links below.Domain controllers running the Microsoft Windows NT Server 4.0 operating system are NOT supported with Windows Server 2008.Servers running Windows NT Server 4.0 are NOT supported by domain controllers that are running Windows Server 2008, meaning you MUST have additional DCs running Windows 2000/2003 to support older NT 4.0 servers.The first Windows Server 2008 domain controller in a forest must be a global catalog server and it cannot be an RODC.
Windows Server 2003, and Windows NT 4.0
only 2008 servers
Intersite Topology Generator (ISTG), which is responsible for the connections among the sites. By default Windows 2003 Forest level functionality has this role. By Default the first Server has this role. If that server can no longer preform this role then the next server with the highest GUID then takes over the role of ISTG.
only 2008 servers
Windows Server 2003 interimSupported domain controllers: Windows NT 4.0, Windows Server 2003Supported features: There are no domain-wide features activated at this level. All domains in a forest are automatically raised to this level when the forest level increases to interim. This mode is only used when you upgrade domain controllers in Windows NT 4.0 domains to Windows Server 2003 domain controllers.
Schema
Raise the Domain Functional Level for 2008 server Applies To: Windows Server 2008, Windows Server 2008 R2 When you install Active Directory Domain Services (AD DS) on a server running Windows Server 2008 R2, a set of basic Active Directory features is enabled by default. In addition to the basic Active Directory features on individual domain controllers, there are new domain-wide and forest-wide Active Directory features available when all domain controllers in a domain or forest are running Windows Server 2008 R2. For the new domain-wide features to be enabled, all domain controllers in the domain must be running Windows Server 2008 R2, and the domain functional level must be raised to Windows Server 2008 R2. Membership required: Domain Admins or Enterprise Admins To raise the domain functional level 1.Open Active Directory Domains and Trusts. To open Active Directory Domains and Trusts, click Start, click Administrative Tools, and then click Active Directory Domains and Trusts. 2.In the console tree, right-click the domain for which you want to raise functional level, and then click Raise Domain Functional Level. 3.In Select an available domain functional level, do one of the following: * To raise the domain functional level to Windows Server 2008, click Windows Server 2008, and then click Raise. * To raise the domain functional level to Windows Server 2008 R2, click Windows Server 2008 R2, and then click Raise. Caution Do not raise the domain functional level to a later version (such as Windows Server 2008 or Windows Server 2008 R2) if you have or will have any domain controllers running earlier versions of Windows Server. Important After you set the domain functional level to a certain value, you cannot roll back or lower the domain functional level, with one exception: when you raise the domain functional level to Windows Server 2008 R2 and if the forest functional level is Windows Server 2008 or lower, you have the option of rolling the domain functional level back to Windows Server 2008. You can lower the domain functional level only from Windows Server 2008 R2 to Windows Server 2008. If the domain functional level is set to Windows Server 2008 R2, it cannot be rolled back, for example, to Windows Server 2003.
Only one Schema Master are user in Forest