Outlook 2000 support for Exchange 5.5

Hi,
Currently we have Office 2K, with Outlook 2000 configured to run our POP Server. Now we recently installed one Exchnage 5.5 Server.
What is the option to have make Outlook 2000 work as Exchange client + support the original POP email server without reinstalling/ uninstalling Office 2K.
At present the guy login to domain & use it as POP Server.
Is there any Office or Exchnage patch that I can run & get Exchange Server options in Outlook 2000 (right click Outlook2K Properties – add Exchange server) ? If yes, tell me the URLs ASAP.

Akash