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When you encounter a compatibility warning, you're redirected to a help topic for more information.

On my Windows 8 Pro x64 RTM, downloaded from MSDN and installed as an in-place upgrade on Windows 7 Ultimate x64, the compatibility help shows

You're using a prerelease version of Windows 8.

when you expand the "What version of Windows as I using?" link.

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Is this normal and expected behavior (something that Microsoft neglected to update during the release cycle) or is there something wrong with my install?

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Strange but true, maybe because it is a MSDN release before it goes public? or MS screwed up. – Moab Oct 16 '12 at 21:48
@Moab: It'll be fun to have someone check one of the paid editions coming out later this month. – Ben Voigt Oct 16 '12 at 21:57
This seems to more of a problem with the fact, Windows 8 has not been released yet, I would wait until Oct 26 to change anything about your system. – Ramhound Oct 22 '12 at 19:39
@Ramhound: Windows 8 has already been released to MSDN subscribers. But perhaps it's pulling information from a web server somewhere that isn't ready for the release (if true, that would totally destroy the value of the information shown, because it doesn't reflect the local system). – Ben Voigt Oct 22 '12 at 20:12

When you download Windows 8 from MSDN, it's indeed the build 9200.16420, but the official one might be 9200.16500 or something like that... Microsoft is hard to understand with there "build" in Windows.

I have exactly the same release and I have the same problem. Even if I got it from MSDNAA!

When the official will be released, just upgrade from the pre-release to the official one or keep the RC until it desactivate.

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Your solution to his problem is to use Release Preview which means no upgrade path ( only able to transfer user files ) and what is clearly an unsupported version of Windows 8? – Ramhound Oct 22 '12 at 19:41

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