The ribbon tab is not a default in Outlook 2016's main interface is Review.
The Ribbon tab in outlook has the options or commands used to do the tasks. Like creating new email, deleting emails, opening a new meeting request, defining category to an item. However, The Ribbon takes up a lot of space on Outlook 2016 screen.
It has Home, Send/Receive mails and Folder options on the ribbon tab except Review.
Thus, the ribbon tab is not a default in Outlook 2016's main interface is Review.
Learn more about ribbon tab.
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