Christian_Schindler We have no ETA at the moment for Outlook, however today you are able to use the third-party plugin Proxy Manager to send from aliases. OWA is the first priority and after that we will turn our attention to Outlook.
wkwi108Plus addressing for deliveries via Exchange Online (Protection) will work as we plan to process the emails before sending to on-premises which will allow seamless deliveries. For sending from aliases and the scenarios around that, we are focusing on cloud hosted mailboxes. At a later stage we will review the missing functionality for on-premises mailboxes.
wesleykirklandmbAs this is a paradigm shift for the service, we will be working with many partner teams to unlock alias scenarios beyond basic mail flow. Our priority is to get out basic functionality as soon as possible and follow up with iterative improvements and additions. As such, I apologise that we cannot commit to supporting Calendar invites from the start.