Some users have noticed a toggle at the top right in the Outlook software app to switch to New Outlook
New Outlook is very similar to the Web Browser version of Outlook.
While fine for basic use, there are some features that are not yet working in New Outlook.
If you switched to New, you will have both versions on your system and you can open Classic Outlook separately.
To switch back to Classic: Click Windows icon at lower left, type Outlook, Click “Outlook” App to open Classic version OR Click “Outlook (new)” to open the New version.
You can ‘pin’ one or both to the Windows bottom task bar: When a program is open, Right-click the icon in the taskbar and click ‘Pin to taskbar’.