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Configuring a domain controller to serve as a global catalog server is a fairly straightforward process. To begin, open the Active Directory Sites and Services management console. When it opens, expand Sites within the tree view. Below the Sites node, expand your site's name; then expand the Servers node in which your server's name is listed. Find the NTDS node, right-click it, and choose Properties. On the General page of the Properties dialog box, select the Global Catalog checkbox.
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To open Active Directory Sites and Services, from the Start menu select All Programs Administrative Tools
Active Directory Sites and Services.