Error while importing via Tools -> Import

Today I got a question regarding importing via the CRM Import tool (Menubar -> Tools -> Import). Only a small number of records would import, all the others would not. Even though the source seemed fine, they did throw this error:0x80040328: Number of columns does not match the header rowThis appears to be related to the source anyway. When you save an file in Excel 2003 as csv, it does the