Yes, this is not supported in Excel 2003 but is supported in Excel 2007. When you attempt to add a worksheet, Microsoft Excel 2007 may pop up an error message and link to a Help topic. This Help topic contains a usable workaround that will instruct you to change any options necessary to complete the action. Due to certain changes in the programming model for Excel 2003, the SmartClient cannot use a worksheet that wasn’t included with it. The SmartClient comes with three worksheets, and you cannot create a new worksheet in Excel 2003 and use SmartClient actions with it.
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