If you’ve switched to the New Outlook & want to switch back to Classic Outlook but you discover that the toggle is missing in the Outlook UI, read the following instructions & apply the referenced Registry Key:
- Toggling out of the new Outlook for Windows preview
https://support.microsoft.com/en-us/office/toggling-out-of-the-new-outlook-for-windows-preview-ec102b39-5727-418e-ae1f-a1805434640c
kurtsh
Kurt Shintaku's Blog 
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