When it comes to security updates, those that fix vulnerabilities in an operating system used by billions are high on the mandatory agenda. Which is why it has not been the greatest month for Microsoft. What with the online furore after a recent Windows security patch added a mysterious folder, without any explanation, and social media “experts” advised users to delete it, only for Microsoft to issue an advisory warning that would leave them open to attack. That update, and the installation of the inetpub folder, has now been shown to actually open the path to a different Windows hack attack. Now the whole Windows security update business has another contentious issue to deal with: charging a monthly subscription to receive no-reboot security “hotpatch” updates.