You mistook knowing that fixes will always be part of development with knowing there are problems to begin with. As a developer, you cannot possibly state that you code is perfect, only that you produce code without known problems. I do. Microsoft does, most of the time, and Sun does, most of the time. the business end is time to market. Of course, sloppy delivery will mean no support in the community.
No, I think it's very clear.
You just mentioned that some 50 people in your company will be moving forward with .NET work. And the bottom line is that .NET is new, and has not been 'shaken out', so there are certainly problems that you don't even know about yet.
So you're selling a solution that *certainly* has issues, without telling the client that you know there will be fixes needed. You're making promises you absolutely can not keep. But by the time the client finds out you can't keep the promises, you'll have already cashed the check and you'll say, "that's just what you should expect, there's always fixes needed in something new. No, Java wouldn't have anywhere as many problems, since it's been heavily tested going on a decade now, but you don't want Java, because now you've spent all this money, and we've locked you into a contract . . ."
I would have said the same thing to anyone planning to use Java for mission-critical work before about the 1.2 release. You see, that's the difference between my "preference" and your "bias". I would not try and sell a customer on using untested technology for critical work. I have no "relationship" with either Sun or MS, my only master is my client. I have no motive to lie to sell anything.
What you're doing, in my experience, is making promises you can't possibly keep to generate revenue.
Then *when* it blows up, as you said to this person, you'll just act like that's life, and likely offer to charge to fix the problems.
I believe this is professional fraud, promising your product can do things it can't. Which, I believe, is why MS has never made any serious inroads into the server side. And likely still won't.
Finding people to pay you to try out new, untested things that you don't even know if it will work is going to be very hard.