How to create a password to excel 2003 and 2007?

            1.    On the File menu, click Save As.

        

2.    On the Tools menu, click General Options.

  3. Do either or both of the following:

1.    If    you want users to enter a password before they can view the   Workbook, type a password in the Password to open box, and then click OK.

2.    If       you want users to enter a password before they can save changes to the workbook, type a password in the Password to modify box.

NOTE:   Unlike passwords you specify in the Password to open box, passwords you specify in the Password to modify box are not encrypted. These passwords are only meant to give specific users permission to modify workbook data. For optimal password security, it's best to assign both passwords. An encrypted password to access the workbook, and one to provide specific users with permission to modify its content.

 IMPORTANT   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. Use a strong password that you can remember so that you don't have to write it down.

    4.    Click on SAVE.