In Excel, every workbook has 255 columns and 65,526 rows. These values are fixed and cannot be changed. If you need more rows, you might want to consider using a database (such as Access) or another spreadsheet (Quattro Pro can handle a million rows) for data storage. In most cases, you probably don't need to work with all of your data at once. You'll usually need only a subset of your data. You can use Excel's Data, Get External Data command to query the database and bring in only the records you need.