It&#x27;s sad to see that Mozilla considers desktop email clients as outdated. It&#x27;s true that most people use phone apps and webmail, but in enterprises the story is completely different. MS Outlook rules in many places, but I&#x27;d bet there are at least a few million people using Thunderbird as their desktop mail client, more so in a (slightly &quot;hostile&quot;) MS Exchange environment.<p>If Thunderbird were to really evolve and provide what people have been asking for for a very, very, very long time, it is good calendaring that &quot;just works&quot; with MS Exchange (I know about the extensions and external applications available, but none of them provide a seamless experience or all features that are required for calendaring).<p>Post Edward Snowden&#x27;s revelations, more people need a good way to do encrypted mails well too (that&#x27;s complex and is also more of a user experience issue, but an organization like the erstwhile Mozilla Messaging could have spent a good amount of effort on it). Along with this, we would have encrypted chats (since chat is already part of Thunderbird), encrypted voice calls, etc. That would be phenomenal!<p>IMO, Mozilla really lost focus on Thunderbird long before it decided to shelve it as a &quot;community driven project&quot;.