Outlook for Windows (also referred to as New Outlook) is an email client developed by Microsoft. It is a replacement of the preloaded Windows Mail and Calendar apps on Windows 10 and 11, and will ship as default with Windows 11 from late 2024 onwards. The new Outlook was outlined under Microsoft's 'One Outlook' plan, with testing starting in 2022. In September 2023, Microsoft started transitioning... Wikipedia