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Security  Use strong passwords that combine upper- 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.

1. Open the document.
2. Enter the password (password: A sequence of characters needed to access computer systems, files, and Internet services. Strong passwords combine uppercase and lowercase letters, numbers, and symbols.) when prompted.
3. On the Tools menu, click Options, and click the Security tab.
4. In the Password to open box or the Password to modify box, select the placeholder symbols (usually asterisks) that represent the existing password.

5. Do one of the following:

   • To remove the password, press DELETE, and then click OK.

   • To change the password, type the new password, and then click OK.

     If you changed the password, reenter the new password, and then click OK.