Beware of pop-ups while browsing online

What should I do if the error message appears?
Microsoft will never include telephone numbers in its warning messages.
If you get this pop-up, or one that looks equally suspicious, close your browser window. If the pop-up keeps appearing, take a screenshot of it and report it to the UCT Computer Security Incident Response Team (CSIRT) at csirt@uct.ac.za. Alternatively, you can report Microsoft-related security incidents to Microsoft’s technical support experts via the Microsoft Answer Desk.
Microsoft has also provided tips on how you can be prepared for security incidents.