If you want to keep up with what is happening at Microsoft, then BlogMS the best source.BlogMS was started in response to customers who wanted to feel closer to the product groups.You will get regular updates about product teams, support teams and other specialist teams within Microsoft. The latest directory of Microsoft Team Blogs consists of over 130 blogs. This has been put Category wise along with its Blog/Feed Name URL. Bookmark it now.
You can check the complete list here.