Here's our Microsoft Office Tip for.. May 17, 2005
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Lock Up Those Docs
You don't need complicated security features to protect your confidential data. When you save an Excel document, simply add a password option. Then only you--and anyone you share the password with--can open the document again. To save a workbook with a password, first choose File, Save As. From the Tools drop-down list, choose General Options. Next, in the Save Options dialog box, type the password you want to use. Click OK. Then, type a filename for your document and click OK.

Don't forget--passwords are case-sensitive.