Forum Discussion
How to revert back to mail from new outlook
As you noted, once you agree to "try" new Outlook, whenever you try to open Microsoft "Mail and Calendar", it will redirect to Outlook 365 instead. I don't claim to be an expert and there may be better options, but one way to make Microsoft Mail and Calendar revert to it's normal behaviour, is to go into "Apps & features" (Start -> Settings -> Apps), then scroll down & click on "Mail and Calendar", then an "Advanced Options" link should appear. Click on that, then scroll down & click the "Reset" button (just above "Uninstall"). You'll need to configure your email again but at least "Mail and Calendar" will then run rather than redirecting to Outlook.
If you choose to revert to Microsoft "Mail and Calendar", you may also wish to uninstall Outlook 365 (you can also do that through "Apps & features").