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I've been using Outlook for iOS for over a week and really like it. Outlook 2016 ( version 15 ) for Mac was clunky so I went back to Apple stock mail app. However I started a new Office 365 subscription I have Outlook version 16 . It runs like a dream and works well with my hosted MS Exchange email. I really like the interface of both apps, but the email features roped me in. Mail sweep for easily finding and take action on a batch of emails, mail retention policies that can be applied globally or to individual folders.

I use retention policies to clean up deal / sale emails as sales usually are done in 30 days, so I have them delete email older than that automatically.

Server side rules - it's really easy to write complex server side rules that run whether or not your devices are online.

This set up does cost you a subscription fee, but it saves you a lot of time managing email. For me the time savings are worth the price.

I check Outlook for Mac every once in a while and am frustrated by the fact that, unlike Outlook for Windows, the list of “Conversations” still doesn’t include one’s own sent emails; you still have to view those in the Reading Pane. It’s not as if I expect total feature parity between Windows and Mac versions, but that difference is particularly galling, especially in long, drawn-out threads (“Conversations”).
 
Bump, bump :) . . .

Went nearly a year and a half with the full-Apple solution described in this thread (which I referred to here) but now have glommed onto MailMate (https://freron.com) for Mac use — still with Apple Mail on iOS — and have been very impressed by both the app and its incredibly dedicated indie developer, as I describe here.
 
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