Sorry mate, double-click selects 'hotmail' here as well.
That's more of a software-dependent thing than a OS-dependent one, shirley. For instance, I used Firefox to do that test: I can't vouch for IE or Photoshop or SmartFTP (on Windows) behaving the same, and I'm fairly sure that some of my Mac apps don't behave like that. (Textwrangler? Interarchy? iTunes?)