There are a lot of great msdn blogs and posts written for or by testers at Microsoft. Given all of these you could probably start to piece together an aggregate of what it means to test a product at Microsoft, but you might be lacking some of the end 2 end experiences. Recently we filmed Sara Ford (an SDET for Visual Studio) go through the experience of analyzing a testcase, debugging the failure on our labs, and ultimately logging a bug discovered in the process. The results of this experiment are currently hosted on the Channel9 Devdiv site. Each segment is less than 15 minutes long. Enjoy!