An update in our Office 365 tenant: Simple sharing links now visible in Office 2013 and 2016! Message from Microsoft:
We’re updating SharePoint and OneDrive, so simple sharing links will be visible within Office 2013 and Office 2016. This feature will begin rolling out May 23rd.
Currently, Office 2013 and Office 2016 do not display a simple sharing link (a link that anyone inside your organization can access) when organizations have anonymous links disabled in SharePoint Online and OneDrive for Business. With this change, Office clients will display simple sharing links if they have this setting enabled. This will be true, even if they have anonymous (guest) links disabled.