I'm probably just weird. At least the general population probably has no such associations with primitive email services.
At the time, we didn't have local dial-up numbers so I used it very extensively. Standard Internet access was very expensive (and I was a young teenager so my parents were paying for it) so I subscribed to dozens of mailing lists and read them all off-line, dialing up to Juno just to send and receive. Most of my "downloading" in those days was facilitated by Juno and "ftp by e-mail".
Trademarks exist to prevent confusion between similar products. Juno, the free dial-up and e-mail provider and Juno the taxi/transportation(?) company are very different.
Juno brings back lots of memories for me as well. I remember having a very hard time convincing everyone it was 'free'.