See???? Seeee???? It was never really ready for me. This is what you get when you give uninhibited idiots like me a forum.
We were ready for the internet. We were not ready for every person with a pulse being able to post to and read from the Internet. Web 1.0 was a beautiful uncharted frontier.
I believe this with all my heart. I wish the Internet had been able to evolve as WAN first for a few decades. Maybe then we might have been ready?
I believe it's MacOS 9 (which seems a bit late for "I'm not ready for the Internet", but maybe it was a hangover from MacOS 8?)
It's the Aqua interface, so that's actually Mac OS X.
Macs had access to the internet long before that, but you were on the right track that OS 9 was the first one to be marketed as "internet-ready." Saying "I'm not ready" in this case is the same as a "Setup networking later." options in current OSes.