» Protecting a Workbook in Excel 2007

Why it is important to protect a workbook?

To prevent the structure from being changed.
To prevent sheets from being deleted.
To prevent new sheets from being inserted.
To prevent hidden sheets from being opened.

To protect a workbook:

1. Select Review -> Protect Workbook (in Changes Group).
2. Type a password in the Password box, and click OK.
3. Confirm the password, and click OK again.