If You Still Use Windows XP, Prepare For the Worst

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As a vicious new strain of ransomware swept the UK’s National Health Service yesterday, shutting off services at hospitals and clinics throughout the region, experts cautioned that the best protection was to download a patch Microsoft had issued in March. The only problem? A reported 90 percent of NHS systems run Windows XP, an operating system Microsoft first introduced in 2001, and hasn’t supported since 2014.

NHS has disputed the 90 percent figure—though not that a significant portion of its systems run Windows XP—and was only one example of the tens of thousands of impacted computers across nearly 100 countries yesterday. But its meltdown illustrates the deeper problems inherent in Windows XP’s prevalence three years after its official demise.