- Letter:
AllA(10)B(8)C(10)D(10)F(7)H(7)I(14)J(2)K(3)L(5)N(7)P(7)R(7)S(11)T(8)U(2)Y(1)Digital(1)Other(5)
- 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)