Reminders

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This is not supported by anything built into Excel. You would have to write VBA that would set a timer. There is a good tutorial on this here: http://www.ozgrid.com/Excel/run-macro-on-time.htm You would also have to develop some way for the user to enter the time that they would want the reminder to fire. The easiest thing would be to enter that data in a worksheet, but you would also have to have a button to set the time. Then decide what you want to happen. For example, you would create a simple user form that would pop up at the desired time.