History of Directory Services
Windows 2000 Active Directory is a directory service. Virtually every directory service in the last decade owes its inception to the X.500 standard. Directory services have evolved as the need for them has changed.
X.500
X.500 is an ISO standard for a directory service. It incorporates a very rich, searchable database of information about the objects it represents. It was first produced in 1988 and has been the standard from which most modern directory service implementations have evolved.
Some of the features of X.500, however, are also the reason it has never been fully implemented as a globally accepted product. It is built to run on the OSI protocol stack, which has never been broadly embraced. It also is very ...
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