A Microsoft-based replacement for an older Unix system needed to be reset every thirty days 'to prevent data overload', as a result of problems found when the system was first rolled out. However, a technician failed to perform the reset at the right time and an internal clock within the system subsequently shut it down. A back-up system also failed. This caused a three-hour radio breakdown that left hundreds of aircraft aloft without guidance on Tuesday.

Follow link to Microsoft software caused air traffic shutdown
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