That's the point, silly.
That fellow put out an open call for .NET success stories, and didn't get any.
If you did the same thing, only asked about Java success stories, you'd be inundated with responses and details.
The only folks using .NET now are the ones paid to try and make .NET work. And they aren't having any big successes yet, as far as anyone can tell. A few small successes, as I have myself had. A few small tools. But large-scale production systems. They're all running into serious problems.
Oh, sure, you MS salesmen *claim* great things. Then never point to one single example. Just trust ya'll, we're told.
Please see my #84.