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I want users to enter only 1 or 0 in a cell column in Excel 2007. Users should not be able to enter anything else than 1 or 0. How can I do this in Excel?

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This page has instructions on how to do it, in detail. I will quote a section though:

Data Validation dialog

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Spot On! Thanks soandos for your answer –  Mark Kevus Aug 18 '11 at 17:04
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