Simple Exchange question – Personal Info

Right now, if I send an email, my user name shows up in the ‘sender’ field. I want to change it so it will show my first name.

I am using Exchange 2000 sp3 with Active Directory. I’ve tried going to my account properties in AD and changing the personal information there, but it still shows my user name when I send something.

Anyone know where I need to make the necessary change?