&gt;<i>I understand, yes, technically adept users can run the server, but there&#x27;s still many who won&#x27;t, who will use your server or someone else&#x27;s server and be required to make this tradeoff.</i><p>So? How&#x27;s that different (if anything it&#x27;s much better) than using Gmail or Outlook on the cloud?<p>Besides, nobody is &quot;required&quot; to do anything. You can always run some Thunderbird or any other desktop client without a cloud component.