Chromebooks may have been on the market longer, but they still didn't become widely available or even nationally advertised until early this year when the Samsung series 3 came out. Additionally, no major OEMs are currently producing Windows RT products calling them "unnecessary," yet 6 major companies are now (or soon will be) offering Chromebooks. Chrome OS was never designed to "kill Microsoft." In fact, I like MS and run Windows 8 Pro on 2 of my 3 PCs. The only purpose of Chrome OS is to encourage development of web based applications for use within the Chrome browser in any form. Hardly a failure as Google didn't take a 900 million dollar loss on the program.