how do i change the way a users name is displayed in exchange server global contact list

I have set up users in server 2000 active directory. eg D_Thomson this is my logon name and also the way it is displayed in the Active directory. the problem is the way that the user is displayed in exchanges global contact list it is also displayed as D_Thomson. The way that i want it to look is David Thomson. Do you have any ideas in how to get the display name the way i want it.? ps sorry if this is the wrong section i couldnt find any section devoted to either server 2000 or exchange.
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Here is a link with pictures of how to do some GAL admin:

If you look, the 3rd picture down, shows a User Account Properties.  Here there is SIMPLE DISPLAY NAME....I think you can make this change here.

I don't have exchange in front of me to test...but maybe this will lead you down the right path.

AceAdminAuthor Commented:
this didn't seem to do it. do i have to restart the exchange server?

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Windows 2000

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