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"With each subsequent release of Windows we're left bracing for what will surely be another overwhelming assortment of retail packaging options. With Windows 7 there was a dizzying 6 SKUs to choose from and we're sorry to say that, at least for now, there are even more coming with Windows 8. As noted by windows 8 beta the registry contains the keys for all current versions of the OS and, with a quick trip to Regedit we were able to verify with the screenshot above. That boils down to the following list:   Windows 8 Starter   Windows 8 Home Basic   Windows 8 Home Premium   Windows 8 Professional   Windows 8 Professional Plus   Windows 8 Enterprise   Windows 8 Enterprise Eval   Windows 8 Ultimate   Windows 8 ARM editionWe will of course point out that this is from the Consumer Preview, so not necessarily a final tally, and the Enterprise Eval version is of course just for trials, but it's interesting to note the addition of Professional Plus. Office 2010 Pro Plus adds in extra integration with Sharepoint and Office Communications Server, leaving us to wonder if this flavor of Windows 8 won't offer some similar collaborative tools. And then there's just that one, lonely ARM edition, which could leave non-x86 hardware buyers out of the cross-shopping fun altogether.Update: As Jack Schofield points out, you couldn't actually choose from all those Windows 7 SKUs, there were only three boxed products available in the US. It remains to be seen how many of these Windows 8 variants will appear at retail here.[Thanks, Sagar]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/03/02/windows-8-versions/>