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.