XP came out in 2001. According to Apple, Safari 5 requires OS X 10.5.8 (Leopard), released in 2007. Microsoft actually has a pretty good track record when it comes to supporting older versions of its operating systems. Just a bad record getting everyone to upgrade to newer versions.
Stop the presses. Apple software like iTunes and Safari STILL RUN ON WINDOWS XP. The difference is in how many users are on XP (50%?) vs. older than OS X Leopard (low single digits).
Related: Firefox, Chrome, Safari, and Chrome Frame are all more advanced than IE9 and all run on Windows XP.
>The difference is in how many users are on XP (50%?) vs. older than OS X Leopard (low single digits).
And the reason for that is probably that Microsoft keeps so much backwards compatibility that the cost of not upgrading the OS is much lower than on OSX.
