If you don’t want to use an add-in in Outlook 2016, you can disable it so that it won’t show up in your messages.
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In Outlook, click File > Manage Add-ins.
Tip: This opens Outlook on the web.
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Under Manage add-ins, in the Turned on column, uncheck the box for the add-in you want to turn off.
Tip: To turn the add-in back on, check the same box.
