- Letter:
AllA(14)B(12)C(14)D(10)F(11)H(9)I(7)L(7)M(13)N(9)P(10)Q(8)S(15)T(12)U(4)V(3)W(3)X(2)Y(2)More
- Operating System:
AllWindows 95(7)Windows 98(7)Windows Me(7)Windows XP(9)Windows Vista(9)Windows 7(9)Windows 8(9)Windows 10(9)Windows 2000(9)Windows Server 2003(9)Windows Server 2008(9)Windows Server 2012(9)Windows Server 2016(9)Mac OS Classic(7)macOS(9)Linux(9)Android(9)iOS(9)