Something to look forward to: If you've previously used Thunderbird, you probably know it's a pretty solid client, but it's not without a hitch – a clumsy user interface and performance issues to name a couple. Fortunately for Thunderbird users, the app is set to receive some pretty big improvements in 2019.
Initially, there is another major interface overhaul on the way (the latest redesign came a few months ago with Thunderbird 60) with a " UX team "Mozilla has gathered. Probably the redesigned app will use several elements of "Photon Design", the Mozilla philosophy is used to create Thunderbird's new logo, as well as the user interface of many of its other services (including Firefox).
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If you don't mind bad formatting, you can see a rough overview of Mozilla's 2019 plans for Thunderbird here. However, please note that the year has only begun and some of the contents of that email address (sent to Mozilla's mailing list) may change as time goes on.
In related news, the Thunderbird team will also be growing. For now, only eight people work on the app, but in 2019 this number can almost double to 14. In theory, this should lead to better, faster updates for the client, but only time will tell for sure.
If you are not already using Thunderbird, you can download it here at TechSpot or via Mozilla's official website.