After long wait Microsoft has officially launched Windows 8. Users can download Windows 8 Pro for $39.99 or Rs 1,999 for digital download and if you want a physical installation disk then it will cost you $69.99. Now this pricing is only available till January 31, 2013 as a special offer from Microsoft. Those people who just brought new PC or Laptop after June 2 and are disappointed because they should have waited to get Windows 8 instead of Windows 7 pre-installed, well Microsoft has some pretty update offer for you guys as well. Users who have purchased new machines after June 2 running Windows 7 will be eligible for an update to Windows 8 for just $14.99 or Rs 699. Just visit http://www.windowsupgradeoffer.com/ to avail this offer. Start downloading Windows 8 Pro from here.