What is X400 & X500 in Active directory.

Posted on 2010-01-12
Medium Priority
Last Modified: 2012-05-08

What is X400 & X500 in Active directory.
Can anyone tell me what these are and some example for these please.

Question by:bsharath
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Expert Comment

by:Glen Knight
ID: 26295226
These are used for legacy Exchange Servers where are you seeing them?
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Accepted Solution

Mike Kline earned 2000 total points
ID: 26295272
x.500 is a standard for directory services  http://en.wikipedia.org/wiki/X.500
x.400 is a standard for messaging/communication http://en.wikipedia.org/wiki/X.400
The wikipedia entries on the subjects are good.
You can think of x.500 as the base for Active Directory.  Want to read about the history of Active Directory and how it came about and how these standards were incorporated.  
Joe summarized a thread from the activedir mail list...best discussion I've ever seen on the history of AD.
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Expert Comment

by:Glen Knight
ID: 26295294
Don't know why but I didn't see the reference to X500 :-(
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Expert Comment

by:Mike Kline
ID: 26295398
...because you are going through so many questions.
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Expert Comment

by:Glen Knight
ID: 26295413


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