Linux on older computer for telecommuting

I have an older computer running Win98 at home and want to use it to telecommute to occasionally. I have a cable modem so speed isn?t an issue, but my OS is. Win98 is not compatible with my company?s Webmail. A techie at lunch suggested that a combo of Linux and Mozilla might be able to handle it, and I must confess that I?ve been toying with the idea of learning more about Linux. Problem is, I don?t know where to start. Can anyone recommend a Linux distribution that is free and easy for someone new to the OS to work with?