The only sure way is to *delete* the columns.

If these columns contain relevant data values and/or formulas, copy the
file, Paste Special, Values.
This way, everything is properly displayed with no chance of revealing any
proprietary information.

However, there is now no chance for this file to perform any computations.

If the recipient is supposed to *use* this file for calculating, then you're
out of luck as far as *absolutely* protecting your confidential information.
--
HTH,

RD

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"hajo" wrote in message
ups.com...
Friends,

I wish to hide columns and wouldnt want the recipient of the Excel file
to Unhide it.
Is this possible?

Regards

HAJO