I just tried to launch Apple's new Mobile Me service and was surprised by this notfication when launching with Internet Explorer 7. This is something I haven't seen covered in any of the major trades or even Apple's own site until now which has up until now noted that IE would be supported which I guess is technically true. It's also interesting the ordering of the buttons below. Normally I'd expect "Get Safari" to be on the far-right. When other services don't support Firefox, users get up in arms. I wonder whether Apple will hear similar complaints (or respond) over this decision. I suspect not since to get the full benefit of Mobile Me, you have to be willing to move your primary email address to a new @me.com domain. In today's day and age, I don't see a lot of people other than the Apple faithful shelling out $90+ a year for email when you can get it for free in so many places. Is Push email worth that cost? POP3 works just fine thanks.
All of this will be moot with the release of Internet Explorer 8 I suspect, but will you see a "Get IE8" button at the bottom? Not likely.