Gmail invites, by 2004 or 2005(?) when I got in were instant. If I sent the invite, the friend had a chance to sign up right then.
But email was already an existing protocol. So invites meant nothing. I could still communicate with my family even though they were still on their ISP account. Or my sister with her university account.
But email was already an existing protocol. So invites meant nothing. I could still communicate with my family even though they were still on their ISP account. Or my sister with her university account.