Richer Ribbon in the Outlook with more capabilities like word.
Michael Newton commented
Now Outlook has combined Follow-up, Categories and Read/Unread under 1 menu in the ribbon it has doubled the number of clicks to categorise and follow-up an email. Now we need to click on Tags, then on Follow-up, then on Tags again, then categorise . Previously they were separate items in the ribbon and a much easier work-flow. Please revert to the original idea!
Annunziata Vincenzo commented
Now Categorize will be grouped under Tags due to limited space in the ribbon.
In this case, the category list won’t show. The same is true of Move to Folder.
If you expand the window size to increase the ribbon space, the button Categorize will display individually and you can see the drop-down list.
Likewise, if you disable the Add-ins from Ribbon or change the OS display definition to a smaller size, it also appears.