Microsoft’s 12-year-old Windows XP operating system powers 95 percent of the world’s automated teller machines, according to NCR, the largest ATM supplier in the US. While the idea of Windows powering ATMs may surprise consumers, XP runs in the background powering the software that bank customers interact with to withdraw money. An upcoming Windows XP support change from Microsoft means ATMs will need to be upgraded and modified throughout 2014. Bloomberg Businessweek reports that the US has 420,000 ATMs, and the majority of them run XP and face a support cutoff from Microsoft soon.