Safari came out at a time when IE 5 (Mac) was showing its age and somewhat before Firefox had become a compelling alternative. Apple needed a browser solution that wasn't dependent on Microsoft so they unveiled their own independent solution, and with IE for Windows and Konqueror for Linux there just isn't a need for Safari on other platforms. But the iPod, iTunes, QuickTime all represent a situation where it is very much in Apple's best interest to develop solutions for Windows.
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Safari came out at a time when IE 5 (Mac) was showing its age and somewhat before Firefox had become a compelling alternative. Apple needed a browser solution that wasn't dependent on Microsoft so they unveiled their own independent solution, and with IE for Windows and Konqueror for Linux there just isn't a need for Safari on other platforms. But the iPod, iTunes, QuickTime all represent a situation where it is very much in Apple's best interest to develop solutions for Windows.