Email is great once its set up, finance manager runs smoothly. Downside: ZERO customer service. You call, you can guarantee to be put on hold and then hung up on every time. Want to email them? No sorry, they don't have a easily found customer service email address to address your problems. You follow the on hold instructions from the automated phone service before they hung up on you? Oh sorry, there is no site for them to recieve a message from you help.yahoo.com/identity does not exist. Message them on facebook? Sorry they won't get back to you. Billion dollar industry with no customer service.
If you need a simple email service then Yahoo is great but if you ever run into a problem with their system then you are screwed. Call their helpline if you want verification on this. See how many times you get hung up on. :)