I used Thunderbird as a work email client around 2012-2013 era. It was decent, but a little sluggish for my taste. I attributed it to my weak office PC at the time.<p>Thinking they've done some interesting updates since then, I tried it again recently, in February 2021.<p>I was disappointed to find a sluggish client with worse UI than it had 8 years ago, defeating the entire purpose of having a desktop email client on a powerful machine. Maybe it was some default settings or whatnot, but I didn't feel like digging around to fix it and there was no advantage in using it over the default Gmail web client. RAM usage was not light either. It all seemed like some weird poor UI wrapper around an Electron instance that just loads the Gmail client.<p>I ended up going back to Opera Mail - a lightweight desktop email client from 2016, that unfortunately isn't getting updated anymore.<p>Not sure what the use case is for that type of software anymore. It didn't feel like a real desktop client.