Shortly Microsoft announced a 300 Mio. $ investment in Barnes & Noble which represents one of the strongest competitors of Apple and Amazon on the ebook market. Barnes & Noble offers one of the biggest collection of ebooks on the US market which is accessable through their Nook readers. The Nook readers are a good ebook reader alternative compared to the popular Amazon Kindle. Microsoft acquired around 17 percent of a new Barnes & Noble ebook spin-off company that will host this new ebook market segment.