An anonymous reader writes: Microsoft has announced that upgrading to Windows 8 Pro will cost $39.99 until January 31 next year, meaning upgrade pricing for new OS will initially be a good deal cheaper than Windows has cost in years past. The $39.99 price will apply if you’re upgrading from Windows XP, Windows Vista or Windows 7, according to this post on the Windows blog. The post says the price will apply in 131 countries. There is one catch — when Windows 8 Pro is available, you’ll need to upgrade via the Windows.com site to get it for $39.99. If you want the software on DVD, it will cost $69.99. As this article notes, the price is reasonably less than what Windows users have been charged in years past.