Microsoft Windows team recently announced an upgrade to the official Windows blogs. As part of this upgrade, Microsoft has merged the Windows Experience Blog, Windows Phone Blog, and Extreme Windows Blog into Blogging Windows. This single blog will feature all Windows and Windows Phone news and will also be where they publish blog posts featuring tips and new apps and games for both Windows and Windows Phone.
Microsoft also said that they will continue to publish blog posts relevant to business customers on the Windows for your Business blog and Building Apps for Windows blog for developers building apps for Windows. Internet Explorer Team will continue to blog on the Exploring IE blog.
Read more about it here.