Google mounts a challenge to Microsoft's Excel with a new Web-based spreadsheet program. Google Spreadsheets supports the import and export of documents in the .xls format used in Excel and the .csv (comma-separated values) format.
Google Spreadsheets allows multiple people to edit or view the spreadsheet at the same time--their names will appear in an on-screen chat window.
An Internet connection and browser is required to use Google Spreadsheet and no software need be installed on your computer. This eliminates the loss of data through hard drive failures or power outages.