Stay safe while using Microsoft Office 2003

You trust Microsoft Office with your most important documents, spreadsheets, e-mail, and presentations. Unfortunately, many of the default security settings in Office applications may not provide a sufficient level of protection for your data, your system, and your reputation. Follow these steps to fine-tune the security settings in Office 2010; tomorrow I'll cover the new security options in Office 2007's Trust Center and elsewhere.

Office 2003 lets you encrypt files so that you need a password to read or edit them. In Word 2003, open the document and click Tools > Protect Document. To restrict the styles that can be applied to the file, check Limit formatting to a selection of styles, and click Settings. Uncheck the styles you don't want to allow, or choose one of the other style-restriction options, and click OK. To make the document read-only, check Allow only this type of editing in the document, and select one of the options in the drop-down menu: Tracked changes, Comments, Filling in forms, or No changes (Read only).

You can also designate the people who can access the file by clicking More users, entering their user names or e-mail addresses, and clicking OK. When you're done, click Yes, Start Enforcing Protection. In the resulting dialog box, choose either Password and enter the password twice that will decrypt the file, or select User authentication, which allows the people you designate to remove the file's protection.

The User authentication option requires Microsoft's Information Rights management, which requires the Windows Rights Management client. This in turn requires a .NET Passport account, and your agreement to the "free trial," though there's no indication if or when the trial will end.

Microsoft Office 2010 Download promises to maintain the privacy of your files, and to make them available for three months after the trial ends, if you maintain the .NET Passport account. There may be a good reason to go this route, but to keep things simple, I stick with the password option. To remove these settings, click Tools > Unprotect document, and enter the password (if you chose this method of protection).