Microsoft's Mac Business Unit has published the results of a recent survey looking at how US people use email.
It has identified common email errors. These include forgetting to include attachments, spelling errors, and replying to all rather than just the sender.
Over 40 per cent of those who use their electronic address book are baby-boomers - born in the 60s and early 70s.
Microsoft also discovered that Mac users are "more likely" than PC users to distribute random shots that they find interesting.
Men send multimedia attachments, such as video and digital photos almost twice as often as women do, Microsoft claims.
Microsoft surveyed 1,000 randomly selected adults for its survey. The company is hosting survey questions online, so readers can assess the line of questioning followed, and check how their answers compare with those found in the survey.