Microsoft had sold a number of simpler email products before, but the first release of Exchange (Exchange Server 4.0 in March 1996) was an entirely new X.400-based client–server groupware system with a single database store, which also supported X.500 directory services. The directory used by Exchange Server eventually became Microsoft's Active Directory service, an LDAP-compliant directory service which was integrated into Windows 2000 as the foundation of Windows Server domains. 

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