Google Utilizes JExcelAPI for Google Spreadsheets
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Google released Google Spreadsheets on June 5th. One of the features of Google spreadsheets is to export and import Excel (xls) files. Google has accomplished this rather easily by using the Java Open API for Excel. After messing with it in my test account, its a pretty cool utility for uploading and creating spreadsheets in a pinch, but its definitely not a replacement for Excel.