It’s used in almost every Microsoft branding campaign ranging from posters to logos, most notably Windows Vista. The official Microsoft branding typeface, Segoe, is a beautiful and elegant font. They are the dedicated forum on TechNet that assist on client application issue. For the further assistance, I would suggest that you post the question to the Office 2016 for Mac forum here.
You can refer to this thread: Segoe UI Font not showing in Office 2011 Mac Font Menus. Based on my knowledge, the Segoe UI does not come with the Office on Mac.
