<< Yes, and it's very hard to get people to buy your hardware when they can't get Outlook, Office, or IE for it; nor support for a gajillian mice. >>
You may know, but you CAN get Outlook, OE, Office and IE. I personally think the software runs better on Windows, but they are indeed available. Additionally, you can buy any USB mouse for it. (And the Mac does support multiple buttons and scrollwheels.)