How licensing works for work and school accounts in the new Outlook for Windows

KrisMattingly bjojade addressing your similar questions together. You are correct, we are no longer offering a free, low-capability email client for M365 commercial accounts on Windows. M365 business/enterprise/edu licensed accounts will need to use the Outlook experiences that you signed up for when you decide on which M365 plan you wanted for your organization. In your case, your licenses included the rights to M365 Web and Mobile apps, which are fantastic. Outlook web will be a great alternative to Windows Mail. It has much more email/calendar capability and a much better experience for interacting with your M365 services like Teams, OneDrive, WXP, etc. 

Windows Mail was intended to be and almost exclusively used as a built-in Windows experience for managing personal email addresses. The new Outlook will continue to support that flow, with many more features that Windows Mail and an ad-supported model. 

We do not and cannot show ads to work accounts. As we are very clear in our terms and conditions, your data is your data and we do not use any commercial customer data for the purposes of delivering ads to users.