> I simply don't understand why some people won't buy the product because it's not open source.

Because Microsoft is putting ads into its email application.

The software people pay for.

Used to be, you could say "If you didn't pay for it, you're the one being sold."

Well, their users damned well did pay for it, and they're still being sold.

You can say you'd never do that.

I'm sure Microsoft would have said they'd never do it five years ago, too.