&gt; What two things?<p>The two things mentioned: quickly-customized inboxes (via search) and handling lots of emails.<p>&gt; How, for example, can I see all the messages from Joe Zwanizol that are more than 15 days but less than 60 days old, using only the keyboard, in five seconds?<p>There&#x27;s a search syntax for that.  Not sure whether you&#x27;ll type it out in five seconds.<p>A browser extension to bring mutt keyboard interface to gmail might be useful for some folk.