I had a client (a national company with multiple locations and call centers!) that was using Lotus Notes for email in 2022, and for all I know they could still be using it. They had to run parallel calendars to work with external event invites, and apparently one of the calendars was backed by a system with a clock that was 5 minutes off because everyone was always getting to virtual meetings at the wrong time.

To this day, 22 years after I have last used Lotus Notes, it remains the worst software product I have had to work with. It tried to be everything and ended up being bad at all of it.

Nah. It was amazing back then.