I came to the Mac party late enough that I missed most of the IE for Mac nonsense. By the time I arrived (shortly after Tiger was released), Safari was on the rise as a real contender.
And I want to make very clear, that it would take something fairly revolutionary to get me to switch *away* from Safari on Macs.
All that said, here’s a question: does the IE team seriously see no value in porting IE to OS X again? We have Safari for Windows (however much of an aberration that seems), and the other major players (and even most all the minor ones), are cross platform. I could see many, especially recent switchers, or people who flip between platforms (home/work for example) having an interest in using IE, especially more recent versions that have much better compatibility and capability.
Just occurred to me while looking at TPM’s browser usage stats.