They don't exactly react to input, do they?
“We haven't implemented IMAP since based on the user feedback and usage data, there isn't a large enough need when you look at the other protocols we provide. For mobile – we believe ActiveSync is the best story."
Well that says it all, doesn't it. I use Gmail because it does IMAP. I'd use any stable, robust service that did IMAP, if I could expect it 'd be around to a while. It's what I use, it's what I know works, it's what I want. Hotmail is obviously not interested in my custom. <shrug>