Simple Display name for internal users

Is it possible to have the Simple Display Name display in Outlook for "internal" users?  I know that this works if the email is being sent to an external address.  This used to work for us in the past (probably a year or two ago) but now it doesn't (except for emails sent to external email addresses).   Everywhere I have read appears that this will not work anymore.  We are using Exchange 2010 SP1.

Thanks in advanced,

Marc
ITBedGuyAsked:
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ITBedGuyAuthor Commented:
Thanks for the link.  Unfortunately that only works if you are sending to an external address.  What I am looking for is something that will work with an internal address.  It used to work that way, but, then it stopped working probably after a patch or service pack update.
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ITDataCenterCommented:
i suggest to check the AD global catalog health used by exchange/clients.
check application/system log viewer, search for errors.
you may increase the level of logging

also how the global address list is built
http://technet.microsoft.com/en-us/library/bb232119.aspx
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ITBedGuyAuthor Commented:
ITDataCenter,

Are you saying that this feature should be working for internal emails?  

Thanks
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