I thought about switching to the New Outlook for a second because of a feature that doesn't exist in the Old Outlook, but does in Mobile: Declining an event still shows up in the Calendar as a Declined Event if you decline on Mobile, but not on Old Outlook. Apparently, it also works this way in New Outlook.
So I opened up New Outlook (which I previously dismissed for lacking features I can't remember which) and tried to replicate my Favorites setup and immediately ran into this issue that I couldn't figure out how to find Properties for the option to show the number of emails in a (search) folder...
Pretty annoying that new features are being added to the New Outlook but the older features aren't even there, am I supposed to use both New & Old to access all the features...? Seems like it's been 2 years and New Outlook still hasn't caught up to the Old one's basic features...