Mozilla’s latest version of Thunderbird email has a brand-new interface that finally brings the aging application closer to modern aesthetic standards.
Now, it’s not like it’s going to absolutely wow you. The new look isn’t a dramatic departure from the aging UI. Instead, it’s a subtle tweak that gives Thunderbird a more in-touch feel that is not just more pleasing to look at but easier to use. It’s more efficient and it offers a cleaner default font that renders text so much better (especially on the Linux desktop).
The good news is that the new-look Thunderbird isn’t such a dramatic departure from the old that you’ll have to scramble to get up to speed
Are they? I think the 3 columns layout is the new version.