ADAM (Active Directory Application Mode) was predeccesor of ADLDS and Microsoft distributed it as additional download. Now in Windows Server 2008 R2 ADLDS (Active Directory Lightweight Directory Services) are built0in server role. ADLDS offers LDAP-based directory service which can be utilized by application LDAP-enabled. In addition to that ADLDS works as Windows-service and is non-operating-system service which allows multiple instances of ADLDS on same machine.

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