Microsoft Surface Tablet for Windows 8
A Microsoft Surface Tablet for Windows 8REUTERS

Microsoft opened its much-awaited operating system Windows 8 Pro for pre-order on Friday, and a packaged DVD to upgrade to the full version of the software is priced at $69.99.

Users can also upgrade Windows 8 online via for $39.99 after its launch on October 26. Online upgrade of the new software is supported in 140 countries worldwide, with 37 languages, and 23 supported currencies.

PCs running Windows XP, Vista and Windows 7 will be able to upgrade to Windows 8. Microsoft also said that users can pre-order new Windows 8 PCs and devices from OEM partners such as Acer, ASUS, Dell, HP, Samsung and Sony. However, the upgrade promotion both online and at retail runs only till January 31, 2013.

Users, who have purchased an eligible Windows 7 PC between June 2, 2012 and January 31, 2013, can upgrade to Windows 8 Pro for $14.99 which will be redeemable starting October 26.

From small and slim tablets to big and beautiful all-in-ones, the new capabilities in Windows 8 have opened the door for a huge array of new and reimagined devices, says Nick Parker, corporate vice president of Microsoft's OEM Division.

"Windows 8 gives Microsoft and our partners the opportunity to think differently and creatively about hardware design with new materials, hinges, touch panels and edgeless displays," said Parker on Microsoft site. "The approach to hardware design and breadth of innovation across all types of PCs results in an incredible amount of choice for customers."

"With the new wave of innovation we're seeing around Windows 8, whatever your needs are, there's a PC that delivers," said Parker.