Makes for interesting reading,
http://news.cnet.com/8301-10805_3-20128013-75/the-inside-story-of-how-microsoft-killed-its-courier-tablet/
Sourced from CNET
Read the complete post at http://wmug.co.uk/blogs/r0b/archive/2011/11/03/interesting-story-about-how-microsoft-handled-their-courier-tablet.aspx