If you need to keep prying eyes out of your important documents then Office has a feature that allows you to password protect your documents from being opened, being changed or both.
All you need to do is go to File, then Save As and then click on the Tools menu. You will see a General Options selection.

In the Save Options dialog box you will have options to assign a password to open or modify your document. There is also an option to make your document read only so no one can save over your original document.

Related Tips:
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Changing your Word Options
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