Compatibility
All of Apple's Bluetooth mice have cross-compatibility with almost every Bluetooth capable computer, though they are not supported by Apple for use on PCs.
Apple's USB mice likewise are compatible with nearly all USB equipped machines.
Prior to USB, Apple created the Apple Desktop Bus (ADB) interface. Though some other manufacturers (Sun, HP, NeXT, etc.) licensed Apple's technology and ADB mice were completely interchangeable between them, the mouse interface IBM introduced on the PS/2 quickly came to dominate the market and crushed all competition. ADB-to-PS/2 adapters were always extraordinarily rare, while the early years of Apple's transition to USB brought with it a raft of popular USB-to-ADB adapters.
Apple's first mice used a DE-9 connection carrying quadrature signals. As the personal computer was still in its infancy with no standards, Apple's mice could be used on any system capable of using such a quadrature mouse, in combination with a spliced cable or adapter as necessary.
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