I have one computer that is running Windows 7, Internet Explorer 11, that cannot add an attendee to a meeting in SharePoint. He gets an error see attached picture. I have narrowed it down to Internet Explorer 11 on his computer.
Logged into another Windows 7 computer (same patch level) as him and was able to add attendees in both IE 10 and Firefox.
Logged into his computer used Firefox and was able to add attendees.
Logged into his computer used IE 11, received the error
Is there security on IE 11 that interferes with SharePoint?