I think I've got a machine ready for 7 Ultimate OEM: it's a Dell with preexisting SLIC 2.1, the cert I've got seems to match as tested with SLIC ToolKit 3.2—but is there a simple way to upgrade, offline or online (online preferred, of course) from Enterprise to Ultimate? After careful research, it looks like Microsoft doesn't want anyone crossing the streams (moving from corporate to consumer editions or vice versa), but I'm hoping someone's got the solution. I'd prefer not having to reinstall, since it's a multi-day process to get all my apps and customizations back in place. Thanks in advance. PS: I've looked at comparison charts until I'm half-blind, so I'll just ask: am I missing anything besides the extra themes? I suspect I can just extract those from the appropriate ISO and install them manually. PPS: I'm considering all this mostly because it looks like SP1 RC1 has moved against stub KMS solutions, and OEM activation looks the most futureproof. Am I wrong?