April 9, 1999 - the first production active directory domain
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One Decade Later: A Look Back at Microsoft's Internal Launc
https://www.youtube.com/watch?v=cK-QCdRX1yY
Believe it or not its the 10th Anniversary of Active Directory! What better way to celebrate it than with a look back at the internal AD deployment on Micro...
On April 9, 1999 the Domain Controllers for the redmond.corp.microsoft.com Windows NT4-based domain were upgraded to a pre-release version of Windows 2000 Server and thus became the world’s first production Active Directory domain: