Because Excel isn't a true wysiwyg application, what you see on screen isn't necessarily an accurate reflection of what will be seen when you print the document. One symptom of this is that, if you minimise the column width at a particular zoom setting, then change the zoom, the margin may seem to increase/decrease disproportionately and numbers may even changed to ###. Conversely, you can have text that apparently extends beyond the cell borders but actually prints within them. If you want a better appreciation of what you'll see in a printout, do a print preview.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]