Just speculating, but probably Safari on Windows was a strategic play, to try to increase the adoption of WebKit and lessen the death-grip IE had on the interne

Just speculating, but probably Safari on Windows was a strategic play, to try to increase the adoption of WebKit and lessen the death-grip IE had on the internet then (and to encourage/give an easy way for web devs to target+test on more than just IE). Much different landscape now. Most devs are running macs now anyway, Chrome exists and is very popular, etc.