If you use the commandline type mxnode -ln > c:\nodes.txt to export your objects. This list can be used to import the objects in the new SIM server. You need to run configure one server to trust both the old SIM server and the new one. Then use the old SIM server to replicate these trusts so the new SIM server now also has a trust. Now you have to configure the agents to allow the new server to read them by either WBEM credentials for Windows and ESX and snmp for Unix servers and older ESX servers. Please fix the credentials before discovering your servers. If you have enclosures please start with these first.