All from at least 2.5/3.0 on was username@aol.com for email. They were also not good at security, as you could spoof emails coming from any domain if you used t

All from at least 2.5/3.0 on was username@aol.com for email. They were also not good at security, as you could spoof emails coming from any domain if you used their smtp servers directly - but they had regular email addresses. I never used compuserve or prodigy, however ICQ used numerical user IDs.