I would say – sign up for a different one now!
If you are a business owner – again, it should be an email address using your own domain name!
If it is for private use, I would suggest signing up for a Gmail account as you can keep it regardless of who your ISP is. When signing up for a free email service have a look into what they offer. For example if you want/need to be able to access your emails on your iPhone you probably want to sign up with a service that offer IMAP (Gmail offers this for free, whilst Yahoo charge for it).