Can i install windows 2000 exchange server on windows 2003 O.S.?

Sorry, You Can't. You Must've format the System.

Can i install windows 2000 exchange server on windows 2003 O.S.?replacement windows

yes you can install exchange server 2000 on windows 2003 server regardless of what the previous poster said.

Can i install windows 2000 exchange server on windows 2003 O.S.?windows mail internet explorer

It is not a possible option.

You need to perform a fresh installation.