We are preparing to replace our two Win2k domain controllers soon, and would prefer to go to 2003 R2. In researching the best migration path for our network, I found a Microsoft article that said it was better to migrate from 2000 to 2003, and then 2003 to 2003 R2, but it gave little reason why, other than for a fast roll-back if everything goes belly up. Other than and easy roll-back, is there a reason that it would be a problem to go straight to R2? I've done some follow up research on that question, and I'm just not finding a lot of information out there about it.