Question : Employee does not show up in Global Address List unless using Advanced Find

We have a Windows 2003 network and we added a new employee to Active Directory and gave him him a mailbox on an Exchange 2003 server.  The issue is that he only shows up in the Global Address List if you look for him under Advanced Find.  Why does he not show up otherwise in the Global Address List and how can we make so he does?  

Answer : Employee does not show up in Global Address List unless using Advanced Find

We have a 5520, and to my knowledge you would need a router in front of it giving it an external IP