Changing Internet Domain Exchange 5.5

I’m running Exchange 5.5 sp 3 on NT 4.0 and need to change the Internet domain name that Exchange handles.

i.e. current domain xyz.com new domain abc.com I don’t need to save any of the previous email or exchange configuration is my best bet to reinstall exchange or can it be easily reconfigured – if so details of how would be appreciated…

Mx record for new domain has already been set up.