Damn this was unexpected. So it seems they’ll just proxying / serving all email to Outlook apps through their servers.
I can already “feel the pain” of alternative email providers getting calls/tickets from their users saying they’ve their email setup in Outlook and that when someone send them an email it takes hours for it to arrive. Then the customer will simply blame the smaller email provider and eventually leave them instead of pointing the finger at Microsoft’s “free” Outlook.
Damn Microsoft that’s really fucking anti-competitive.