What kind of email can i synchronize with Outlook Express without having to buy anything?

I tried it with my yahoo email, but it wouldn't let me so i'm asking. please help
What kind of email can i synchronize with Outlook Express without having to buy anything?
gmail. Also, you may want to consider trying thunderbird instead of outlook express. It's great free email client for mozilla.
Reply:The most popular free account these days seems to be Gmail (Google Mail). It is POP3 accessible with email client programs like OE. However, to become a member, you have to be invited by an existing member.