Set a Password to Open Document, Workbook or Presentation

In the 2007 Microsoft Office, you can set and use passwords to help prevent other people from opening Microsoft Office Word 2007 documents, Microsoft Office Excel 2007 workbooks, and Microsoft Office PowerPoint 2007 presentations. This feature is useful if you create important document that you don't want others to read, especially when you share your computer with others.

So this is how to do it.

1. Click the Microsoft Office Button -- Prepare -- Encrypt Document.
2. In the Password box, type a password, and then click OK. Tips: It is important for you remember your password. If you forget, Microsoft cannot retrieve it. Store the passwords that you write down in a secure place away from the information that they help protect.
3. In the Confirm Password dialog box, in the Reenter password box, type the password again, and then click OK. This is to reconfirm your password.
4. Save your password.
   

Here is a tip from Microsoft about password:

Use strong passwords that combine uppercase and lowercase letters, numbers, and symbols. Weak passwords don't mix these elements. Strong password: Y6dh!et5. Weak password: House27. Passwords should be 8 or more characters in length. A pass phrase that uses 14 or more characters is better.

To give you a better idea about how to do it, here is my tutorial video.

Here are some screen shots..

Hope this helps.