SAN FRANCISCO (CBS SF) — At midnight, Microsoft stops supporting its Windows XP operating system, opening ATM’s around the country up to the possibility of a cyber attack.

NCR, the nation’s largest supplier of ATMs estimated that only 20 to 30 percent of the machines running XP would be fixed before the deadline, according to a CBS News report.

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After the midnight deadline, Microsoft will no longer issue automatic security updates to fix bugs and protect against new viruses.

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“Every time there’s a security flaw that bubbles up or somebody finds a way to take advantage of holes in Windows XP – there will be no one there to fix it,” said CNET Editor Lindsay Turrentine.

Some of the larger banks, including Chase, Bank of America, and Wells Fargo have made deals with Microsoft to continue to receive security support.

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Microsoft has released four operating systems since XP was unveiled 12 years ago.