In fairness, I love and rely on Thunderbird, but I certainly wouldn't call it a triumph of usability. The UI hasn't changed appreciably in more than a decade, a

In fairness, I love and rely on Thunderbird, but I certainly wouldn't call it a triumph of usability. The UI hasn't changed appreciably in more than a decade, and it wasn't particularly easy or pleasant to use even back then. Don't get me wrong, it works well for what it sets out to do, and the stagnation is understandable given how Thunderbird was always treated by Mozilla as a sort of red-headed stepchild before they cut it loose altogether. This is a project that has been operating in survival mode for a long time now. But it does mean that there is space in the market for an email client with a modern UI and some fresh ideas on how to interact with email.