Win2k server

I have router with, let say, WAN ip is 202.163.2.8. LAN ip 192.168.0.1

My server ip is 192.168.0.5, runing exchange on web, example http://192.168.0.5/exchange/user

I have tried my router to port forwarding to my server ip, but when i key in 202.163.2.8/exchange/user on internet explorer, is not working. is there any other configuration to be done??

help me.