SSIS has a problem importing data from Excel if the first few rows (5 I think) are in numeric format, but subsequent rows contain data that cannot be parsed as numerical. There is a way of changing the connection from SSIS to get it t not guess the column type - you need to set IMEX=1 in the connection string Check this article - [Importing data from Excel having Mixed Data Types in a column (SSIS) | Tech Updates](https://munishbansal.wordpress.com/2009/12/15/importing-data-from-excel-having-mixed-data-types-in-a-column-ssis/)
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