Part 2 of getting set up. Obviously, I have an Exchange calendar. Obviously, people are going to be using that to gauge when I’m available. So I need to manage that calendar in a way that works.
Enter the Lightning plugin for Thunderbird! With the previously mentioned DavMail, you can get your exchange calendar in Thunderbird. Which kind of beats Microsoft’s web interface – though not by much.
I also added a Google calendar via CalDav (which works directly with Lightning). Adding and deleting events is nicely synchronized :) Adding another (big) Google calendar, however, borked the overview (appointments no longer shown), though the list above the calendar still showed correct info.