IDC has conducted a Mission Critical Application Platform Study of 500 North American companies that have over 1,000 employees. The study found that Windows is the most popular operating system for mission-critical applications, Microsoft .NET is the most popular application technology platform, and Microsoft has the highest customer satisfaction level of all vendors. You can read more at http://www.microsoft.com/windowsserver/compare/ReportsDetails.mspx?recid=49.