- Letter:
AllA(23)B(16)C(13)D(9)E(5)F(10)G(7)H(14)I(6)J(9)K(88)L(7)M(12)N(9)P(9)R(7)S(14)T(11)U(10)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)