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How do I make sure that in Excel, if I delete some sensitive data and send the file around this is not recoverable?

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You need to specificy which version of Excel you have. This is the link for Excel XP/2003: Office 2003/XP Add-in: Remove Hidden Data

EDIT: See this article for 2007.

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Thanks, got 2003, too bad it's external to Excel! –  Lorenzo Oct 29 '09 at 17:03

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