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If you computer is compatible Office 2003, but you want to make use of the Office 2000/2007 Excel. Now, Xlsx Xlsm to Xls Converter 3000 can help you free batch convert xlsx, xlsm to xls with professional quality and fast speed. User-friendly interface allows you to use very easily without any learning curve. Merely need a few clicks. Add the converted files to the list and click "convert" conversion can be done automatically.