[WasdMan]

Could someone tell me that from one server to another, how to move together with the SMF forum database?

[Nathaniel]

There is some SMF documentation relating to this issue:
http://docs.simplemachines.org/index.php?topic=489.0

As long as you move the entire database and all the files, then SimplePortal will move as well, you shouldn't need to uninstall SimplePortal or any of your other mods.