I've been using Thunderbird for the last 11 years daily at home and at work. Generally, it has been a remarkably stable and pleasant ride.

I remember a few bumps around 08..2010 where I ran beta builds because of some bugs. Also, I used to have extensions that colorized patches and highlighted quotes/threads... but those eventually broke and disappeared.

So, right now I am running a stock Thunderbird with a few profile customizations that tweak fonts (colors and sizes). Hitting GMail (work) and Fastmail (home) servers every minute or so.

Go Thunderbird!

It really needs to have the ability to add arbitrary numbers of physical addresses, email addresses, and phone numbers to a contact in the address book, as well as give each field an arbitrary name. Every other address book on the planet allows this. The fact that it can't makes it unusable for me.

It would also be nice to have a proper three vertical pane view. The way it currently works is horrendous.

What makes your experience unpleasant? My pain point is that dragging attachments to folders doesn't work in Linux. It's been an open bug since 2007 and I've lost hope on that. https://bugs.launchpad.net/ubuntu/+source/mozilla-thunderbir...

Everything else works as it should. I'm not using calendars or syncing address books which probably places me in the long tail of the user distribution.