To improve forest functionality
Open Administrative Tools from Start.
Navigate to Active Directory Domains and Trusts.
Raise Forest Functional Level by performing a right-click on Active Directory Domains and Trusts in the left pane.
Using the graphical user interface (GUI) administrative tools described in the TechNet article on Windows Server 2003 Active Directory functional levels is the most popular way to enable the domain and forest functional levels. Windows Server 2003 is discussed in this article.
Select Administrative Tools from the Start menu. Active Directory Domains and Trusts should be chosen. Right-click Active Directory Domains and Trusts in the console and choose.
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