Excel Watch: An Official Excel Blog: “Probably the most common question the Excel team gets from our customers is ‘when are you going to add more rows/more columns/more rows and more columns’… Well, the answer to the question is ‘in Excel 12.’ Specifically, the Excel 12 grid will be 1,048,576 rows by 16,384 columns. That’s 1,500% more rows and 6,300% more columns than in Excel 2003, and for those of you that are curious, columns now end at XFD instead of IV. “