Mail in Outlook Web App - Microsoft Support
https://prod.support.services.microsoft.com/en-us/office/mail-in-outlook-web-app-ed7b1cb9-ef40-4fbd-a302-278cc7f4dcf5
WebThis article is for Outlook Web App, which is used by organizations that manage email servers running Exchange Server 2013 or 2010. If you're using Microsoft 365, or Exchange Server 2016 or 2019, your email program is Outlook on the web. For help with Outlook on the web, see Get help with Outlook on the web. Working with Mail. What you see in Mail.
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