It can be useful to protect an Excel spreadsheet with a password, for example before sending it by e-mail. Password-protected files are also encrypted, so there’s no way of seeing their contents without knowing the password.
You can do the same with Word documents. The process is virtually identical to that described below for Excel. Access databases can also be password protected, although it’s a little more complicated (look for File | Info | Encrypt with Password).
Here are step-by-step instructions for putting a password on an Excel spreadsheet. Continue reading Password-protect a spreadsheet