Define Uniform UPN

I have the situation below. My AD domain name is abc.com but my registered internet domain is abc.com.my
My users use user@abc.com as the user logon name to logon to the domain (when booting up their pc early in the morning). The same logon name also be use for webmail access and outlook exchange logon. My purpose is to provide the uniform logon name to my user using user@abc.com.my or user@abc since  I can't register abc.com domain name from my ISP (the domain already use by somebody else). How can I do that? I heard about explicit UPN but not very sure
aihaiaiAsked:
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BusbarSolutions ArchitectCommented:
you can add the UPN suffix by using active directory domains and trusts, you either can define it on the OU by using the explicit UPN as u said using ADSIEDIT or let the users choose from the available logon names.
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