The dates
Developer Preview will expire January 15, 2013 Consumer Preview and Release Preview will expire January 16, 2013
Making the migration is really cheap, if you bought a new PC starting June 2nd with Windows 7 and you wanted to try one of the Previews, you still entitled to get the Windows 8 Pro upgrade for $14.99. For everyone else the Pro upgrade is $39.99 (click Here) for the download version and it allows you to upgrade from XP, Vista, 7 and 8. The same upgrade, but the retail box runs for $69.99 — even cheaper if you shop around.
Things to know
You cannot upgrade the Previews versions of the OS. However, you can use the upgrade media to perform a clean install. The prices listed in this article will last until January 31st, 2013 For a limited time Microsoft is also giving away Windows Media Center, which otherwise will cost you $12.79.
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