Hello again,
By an upgrade i mean update the old SIM server version directly to 7.2, as i remember 6.3 would update to 7.0 and 7.0 could be updated to 7.2. This would mean that you would have to update with steps. If you than would install a fresh 7.2 on your 2012, shutdown the old SIM server and you would configure the new setup to connect to the old database.
I think that's a lot of work, a clean install, export objects and import to the new server and do a repair and replicate would be the better option. Updating the database has it's risk as i found out the hard way in the past. SIM does not require any licence, some extra features do but SIM core is free. When you export your object you only export the name of the node, no inventory info. I would think that's not a big issue as the SIM server will build-up that info in a few hours as the datacollection job runs after a discovery. With the clean install you have the advantage that you have a running SIM server and there is no time stress, you can finish the new server in your own time.
If you need more help don't hesitate to ask...
