I've been reading some blogs and articles lately and one thing I noticed a couple of times was authors stating that Microsoft 'doesn't use their own technologies' with respect to developing applications using the .NET framework (specifically, desktop applications).
There's not a whole lot of information that I can see as to what platforms their products are developed with. I had heard that Media Center has some .NET code, but not 100%, likewise with SQL Server Management Studio.
So the question I ask is, does anyone know of any software, made by Microsoft that is 100% .NET code?