What email client should I sign my grandparents up for?

My grandparents currently share a Verizon email account which was no problem when they only had a desktop. But now my grandmother has acquired a laptop and wishes to check her email on it. This should not be a problem but apparently once you view an email with Verizon it takes it off the server because if an email is read on their desktop she cannot receive it on her laptop. >_>

I use yahoo mail and also have a gmail account. I think that yahoo mail is way to cluttered with stuff for my grandparents to use. I am thinking that gmail is the way to go but is there anything out there that’s even more friendly?