Origins With X.500, Novell, and Lotus Software
Novell and Lotus supplied the two largest software directory systems. Each of these companies started with flat account and directory structures, and encountered the support and name-conflict limitations inherent in their flat structures. They adopted the X.500 OU concept into their next-generation software around 1993 -- Novell with the release of Novell Directory Services (subsequently known as eDirectory), and Lotus with the release of the third version of Lotus Notes. Microsoft allegedly used Novell's directory as a blueprint for the first released versions of AD, but this claim appears suspect, given that X.500 served as the "granddaddy" of all directory systems.
Read more about this topic: Organizational Unit
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