If only it was a mere 7!
*Counts on fingers*
I have 7 different mail boxes set up on the Demon address alone. Then there's my work email address, my OU tutor email address, my OU student email address, my 3 Yahoo email addresses (mostly used for sending practice emails to students when I'm teaching Introduction to Web & Email courses), there's my Gmail address, that I never have used for anything, but it seemed like a good idea at the time.
Total 14. Oh, dear! And I do use all of them apart from the Gmail. Which I'm sure I'll find a use for some day.