I just thought that since we were talking about which email format we use, how about "How many email" accounts do we have?
I have 6 local email accounts through my ISP. I then have 5 more through Gmail, Outlook, Live and Hotmail. If I include my work that is another 2.
So, for myself, I have 13 active email accounts that I really do use. Now of those 13, well 5 are actually created to keep "cloud" space to store free files, music and pictures.