Excel 2007 lost file after reboot

My boss just put in 25 hours of work on a complex Excel workbook, saving every 10 minutes or so.  His PC was working slowly, so he rebooted.  The file by the name he gave it is many hours old.  What happened to all the updates and saves?
David_W_RAsked:
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psychokraftCommented:
In excel 2007 click the office button on the top left of the screen. When the new window opens look at the save option. If the Save AuotRecover information check box is checked then the file can be found in the location listed in the AutoRecover file location on the next line.
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byundtMechanical EngineerCommented:
Was the file an email attachment? If so it might have been saved to a temp folder. To find it, open the attachment again, then do a Save As and make note of the file location.

Another possibility is that the file was saved to the default file location instead of the desired folder. You can find out where by clicking the Office icon (top left corner of window)...Excel Options...Save.
Default File LocationIf that approach fails, I suggest doing a search on the computer by file name.
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David_W_RAuthor Commented:
Thanks for the good suggestions.  Appears the file was just not updating, though, since it's nowhere to be found.  Must not have actually been saving, I guess, not having witnessed these actions myself.
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