How do I create a Custom attribute and apply to users in Active Directory

I need to create a CUSTOM ATTRIBUTE in AD and then apply to selective users. Once applied I need to apply a filter Exchange so I can apply a recipient policy to selective users based on this CUSTOME ATTRIBUTE.

Would appreciate if anyone coudl provide details on how to create one

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This article has a tutorial covering creating a custom attribute in active directory

Not sure what version of Exchange you're on, but have a look at this post - the accepted solution shows how to use the custom attribute for addressing.

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ccfcfcAuthor Commented:
I am using  Exchange 2003 if that helps ?
Everything I read talks about Exchange advanced on AD User and Computers. But I dont have that when I open my AD U and Computers MMC. How come I do not see this ?
Weird that it hides it, but there's a KB article about how to add it in...
ccfcfcAuthor Commented:
Thanks, that is weird, we have always had that TAB turned on even though Advanced was not turned on.
DO you know if this is a safe way to apply a "recipient policy" for a new email DOMAIN in an already AD DOMAIN. I want to remove the issue of this new policy going through and changing everyones PRIMARY SMTP to this new DOMAIN  ?

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