- 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(2)Windows 98(2)Windows Me(2)Windows XP(2)Windows Vista(2)Windows 7(2)Windows 8(2)Windows 10(2)Windows 2000(2)Windows Server 2003(2)Windows Server 2008(2)Windows Server 2012(2)Windows Server 2016(2)Mac OS Classic(2)macOS(2)Linux(2)Android(2)iOS(2)