Here is a list of some widely used email clients, in alphabetical order by operating system.
Mac OS:
Microsoft Windows:
Unix/Linux:
Palm OS:
Pocket PC:
... 5.1% from 18 to 24, 32.6% from 25 to 44, 31.2% from 45 to 64, and 9.4% who are 65 years of age or older. The median age is 42 years. For every 100 females there are 126.2 ...