You know the feeling. You've labored over a spreadsheet, entering data, working out the formulas, making the calculations, and then poof! In the flash of a power outage or a moment of craziness when you accidentally closed the file without saving, it's all gone. Well, maybe not. This week, Excel guru David Ringstrom shows us how to go back in time and recover those spreadsheets that might not be as lost as you thought they were.
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