Aseem KishoreTwitter: For the simple reason that Excel passwords can easily be cracked. This is because Excel uses a very weak form of encryption that can easily be broken use dictionary attacks and brute force attacks. The older the version of Excel, the easier it gets to crack the password. In addition to password protecting your Excel file, you can secure it further by encrypting the entire file. This will safeguard your document if it is stolen from your computer. Now on to actually adding a password to an Excel file. When MS Office Excel 2007 buy online Microsoft Excel, there are a couple of different ways that you can password protect your spreadsheet or workbook. One of the first and easiest methods is to password protect the entire sheet MS Office Excel 2007 buy online workbook. When a pop-up window appears, select your options and type in the desired password. Your password can be something random that no one would ever suspect like 45pQ93S21! In order to remember your password, use a password manager program like LastPass, which is super secure. You can also read my previous post on securing your data and passwords. Next, password protect the entire workbook. To do this, click on File, then Save As.