I strongly recommend against making Exchange 2000 a domain controller or a Global Catalog server. There are several reasons for this. First, both Exchange 2000 and Active Directory are resource-intensive applications. Indeed, the server may very well overwhelm itself with lookups and other requests while providing both functions. Second, it seriously complicates recovery in the event of failure or disaster. Not only would you need to recover Exchange, but you would also need to recover Active Directory, as well.
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