Networker Server Migration from v7.2 on Win 2000 to v7.5 on Win 2003

Hello,
I want to migrate my Networker Server from version 7.2 on windows 2000 to version 7.5 on windows 2003.
I want to know how to do that step by step because the solution is critical.
The migration will be performed on different servers.
The old server contain the Networker Server v7.2 on windows 2000. The new one must be on windows 2003 with Networker Server v7.5.
The two servers are branded Fujitsu Siemens Computers.
Thanks