Ubuntu on Windows
Surprised I don't see anyone else mentioning this.This looks to me like typical Microsoft strategy that they utilized a lot 25 years ago.1. when not leader in given market, make your product fully compatible with competitor2. start gaining momentum (e.g. why should I use Linux, when on Windows I can run both Linux and Windows applications)3. once becoming leader break up compatibility4. rinse and repeatHappened with MS-DOS, Word, Excel, Internet Explorer, and others.