I first had an email address ca. 1993 or so. I worked for a software developer at the time and I think it was some proprietary system or another that one of the geeks set up. In 1995 I went to work for a different developer and as I recall we used an early version of Outlook, before it was called Outlook. Microsoft Mail, maybe. Then they screwed around with a Lotus Notes application that was supposed to do much more than mail, but it was a fiasco.