Microsoft is working on a single version of Outlook that will replace its current Windows 10 Mail and Calendar apps, as well as its legacy Win 32 Outlook client with a single Outlook client for Windows and Mac. The new mail/calendar client, codenamed “Project Monarch,” according to Windows Central, is part of the company’s “One Outlook” plan, and will be derived from the current Outlook Web app.
Link: Microsoft to replace its many mail variants with ‘One Outlook’
via http://www.zdnet.com