You take a look and see the button is either non-existent or greyed out. You may have a user that runs into a strange issue: they cannot access or acquire new add-ins in their Outlook for Mac install. Why is the add in button greyed out on outlook for Mac? Uncheck the Hide On My Computer folders check box. On the Outlook Preferences dialog box, click on the General icon (top row). New Contact List icon is grayed out in Mac Outlook 2016.
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