I am very dependent on Thunderbird.
I work on a number of machines, Windows 10 (mostly) Linux (sometimes) and OS X (more rarely than I used to) and I use gmail as mail service and google's calendar to manage appointments.
And, while I'm retired and my calendar is not as stuffed with meetings and things as it used to be, lockdown has embiggened it a bit with scheduled video calls, sometimes across timezones.
Thunderbird has the advantage of working across all the three platforms I use, meaning (a) I don't have to think too hard and (b) I can maintain a degree of consistency.
All good. I've tried (and even paid for) some alternative email clients, but at the end of the day I always come back to Thunderbird. Clunky but reliable - kind of like my 20 year old Impreza.
So, yesterday morning, I fired up Thunderbird to check my mail and see what was on for the day.
No calendar. Thunderbird had upgraded itself overnight and disabled the bit of magic 'Provider for Google Calendar' that makes it work with Google calendar due to incompatibilities,
I was not happy