Since this tool is provided for free, some features that are found in the standard version of Excel are not available. For instance, you cannot edit any of the data within the Excel workbook. There is no function to save the workbook or to create a new workbook. The primary purpose of Excel Viewer 2007 is to open Excel workbooks for viewing and printing, and that is exactly what the software does.
Third-party alternatives do exist, however, that allow you to open and edit Excel files, along with many other Microsoft Office files. OpenOffice.org, Google Docs, and Zoho.com are a few examples of programs and websites that allow you to edit common Office files. While these programs are useful, they may not display Excel files (especially Excel 2007) in exactly the same format that Excel does. For this reason, Excel Viewer 2007 is superior if you only need to view files.