Anna is the director of a small kindergarten in Zurich. To give the kindergarten a home on the Internet, she registered a domain name and put up a website where parents can get up-to-date information about the kindergarten. A friend helped her to install a popular open-source content management system (CMS) for the website, so that she can change the menu every week and perform other updates herself. The parents of the kids were delighted to have access to this information online.
Three months after the website went online, one of the parents called her, telling her that the website was no longer available, and a warning was displayed instead. He also told her that he had a virus on his home PC and had to reinstall his operating system and change all his Internet passwords. When she talked to other parents that day, they told her the same.
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