I've never seen columns unhide when the user is just viewing the worksheet, but
I have seen columns unhide (just temporarily) when building formulas by pointing
and clicking.

When do the columns show up?

Concerned friend wrote:

Has anyone had any problem with forwarding an Excel 2007 spreadsheet in which
a hidden column when forwarded in an email then shows the recipient the
hidden information. Can a hidden column, "unhide" on its own?

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Dave Peterson