- Letter:
AllA(10)B(8)C(11)D(7)F(3)G(7)H(19)I(22)K(15)L(7)M(12)N(7)O(4)P(13)R(3)S(11)T(10)U(3)W(16)More
- Operating System:
AllWindows XP(3)Windows Vista(3)Windows 7(3)Windows 8(3)Windows 10(3)Windows 2000(3)Windows Server 2003(3)Windows Server 2008(3)Windows Server 2012(3)Windows Server 2016(3)Mac OS Classic(3)macOS(3)Linux(3)iOS(3)