Microsoft’s One Outlook program aims to rationalize the current client set. The Edge WebView2 component allows Outlook desktop to reuse OWA features, which is why Microsoft now distributes WebView2 with the Microsoft 365 apps for enterprise (desktop apps). We’re now seeing signs of reuse with an obvious example being the appearance of OWA’s room finder in Outlook for Windows.
Project Moca is a new Office 365 personal productivity app which doesn’t have a mobile app. It’s hard to be productive if you can’t be when mobile. Which is why To Do allows people to capture thoughts. A workaround of sorts is available through To Do tasks. Whether this is enough for you to switch to Moca is debatable.