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Wake-up call: Tech glitches bring down NYSE, United Airlines

Computer problems halt trading on NYSE for nearly four hours and ground thousands of United Airlines flights -- reminding us how vulnerable these major systems are to technology troubles.

This was a bad day for technology.

Computer glitches brought the New York Stock Exchange to a halt for nearly four hours, and grounded United Airlines flights around the world. Even the Wall Street Journal website was down for a short time on Wednesday. The Department of Homeland Security said there was no evidence that these were part of malicious cyberattack. Even so, it reveals how vulnerable major systems are to tech troubles.

Meanwhile, Microsoft is dealing with drama of its own, cutting 7,800 employees and restructuring its phone hardware division. CNET Update has the details:

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Wake-up call: Tech glitches bring down NYSE, United Airlines