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Windows Update Ambush - the moment at the end of a work day, when you're ready to leave the office and so click Shut Down on your Windows laptop. Then suddenly a message appears on screen saying, "Installing update 1 of 13, do not unplug your computer." Effectively ambushes you at the end of the day leaving you unable to take your laptop and leave, or continue working, for another 15-30 mins.
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