There is general agreement that Vista will be the last major MS operating system release for some time to come. However, does it represent the last major release of the Microsoft operating system, period? Discussions are growing on the subject. Gartner Research predicts (http://www.investors.com/editorial/IBDArticles.asp?artsec=17&artnum=2&issue=20061229) this is the last major release as we know it. Future OSes from Microsoft will be modular and released incrementally. Other analysts a