1. The evolution of diverse technologies has chipped away at Microsoft’s lock on the desktop.
2. Vista took too long and ultimately sucks too much. Given that, leaders are starting to question the "no one ever got fired for recommending Microsoft" mentality.
The U.S. Department of Transportation (DOT) has banned Windows Vista, Office 2007, and Internet Explorer 2007 from its offices, and is considering switching its operations to Macs and PCs running Novell’s SuSe Linux. The DOT enacted the ban in mid-January, according to one blogger, because certain applications essential to the agency’s function can’t run on Windows Vista. Microsoft has attracted intense criticism over its new operating system since it began shipping earlier this year, lacking proper driver software for a wide array of devices and utilizing a new user interface that closely resembles Apple’s Mac OS X 10.4 Tiger system. Apple is also taking aim at the enterprise market with its upcoming Mac OS X 10.5 Leopard release, which incorporates numerous features that cater to large business needs.