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then you do the abstract upgrade. export everything, install and import every (migration wizard)My understanding from an IT consultant who works with Microsoft locally is that you will not be able to upgrade from the RC version to the real mccoy. In other words: you will have to wipe everything and start again. Beware and Be Aware!
They don't usually support it with RC's and Beta's to final products. These builds won't be included in the list of OS's that you can upgrade from, so it's only possible if you modify the cversion.ini like DJNome said.+1 Upgrading your OS is never a good idea, although Microsoft usually "Support it" I'd also say go with a clean install.