If you have sensitive data you'd like to keep from prying eyes in a Microsoft Excel file, the easiest way to protect it is with Excel's built-in password tools.

You worked hard to put that Excel sheet together, now protect it from unintended damage.

The larger a spreadsheet gets, the more likely you'll want to start hiding rows or columns or maybe you've been given a sheet that has hidden rows or columns.

14. To make all cells editable again, click on "Unprotect Sheet" — which is in the "Protect" tab under "Review" — and re-enter your password. The cells will now be unlocked.

If a user inadvertently changes the formulas in your Excel workbooks, all your hard work could go out the window. This ebook explains how to protect and hide those formulas so they remain safe and ...