I think you’re missing a lot of metadata (last modified, history?) in those files. Haven’t checked in a while, though.

Definitely Ultima, but possibly branching off from 7.

Back in the day I did enjoy the O’Reilly Linux Administrator guide(s?). I don’t know whether they have been updated, so they might be a little dated in parts - but the writing was highly enjoyable.

They what and what?? Generally the Omada-stack devices are just on-premises hardware that you control. If you enable automatic firmware updates, then yeah, “if they push a bad update” and all (similar to a Linux distro with auto updates enabled). To improve operations, and enable certain features, there is the “cloud-based controller” software (appliance), which is named weirdly, because it generally does not live in the cloud - you can self-host on-premises, though its core software component is a black box and not (F)OSS (also available as an actual hardware appliance). There have been instances of the devices “phoning home”, though you might be able to limit that to some extent with firewall rules.

Just very quickly: the books are so much better than the show! I had to stop watching the show somewhere I think in season 2 - everything started digressing/simplifying too much from the books (the characters became flat and uninteresting etc.) So yeah, I found the books much more enjoyable.

Others already mentioned Thunderbird (originally Sunbird, available as a standalone calendar as well), I am currently using (Gnome) Evolution, which is quite similar in that it provides mail, contacts, calendar and tasks management. Everything integrates well with a CalDAV (calendar, tasks) and CardDAV (not really relevant here, for contacts) for sync.

On Android I can recommend aCalendar (from Tapir Apps?), which also works well with CalDAV.