Microsoft has been extremely tight lipped about the price of its upcoming Windows 8 operating system.The company previously only announced plans to run promotions for people buying eligible PCs with a version of Windows 7 pre-installed, and for users of Windows XP, Vista or Windows 7 in form of a upgrade promotion.

Existing Windows users who want to upgrade their systems to Windows 8 can buy a digital upgrade of Windows 8 that is available for $39.99 until January 31, 2013. Users who do can’t upgrade or do not want to buy an upgrade copy can purchase Windows 8 Pro, the top of the line retail version of the operating system, for $69.99 until January 31, 2013.

Only customers who buy an eligible PC with a previous version of Windows get to pay less than that. They can upgrade to Windows 8 for $14.99. For that, their PC needs to have been purchased between June 2 and January 31.

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