It's not just that Safari is excluded, but that it was only tested on Windows 7 32-bit. Why not test on at least Windows 7 64-bit? Aren't most of Intel's chips 64-bit by now (Core 2 Duo, Core iX)?

And why not Android or iOS? A quick search shows that Microsoft sold 400 million licenses of Windows 7 (32 and 64-bit combined). Apple has sold 250 million iOS devices and there have been 200 million Android devices sold.