At my previous job I did some "data cleansing" of transactional data for our customers, to ensure it was in a usable format to perform ETL on and eventually load into an OLAP datamart for analytics.
You would be surprised how many big (like household name) companies use Excel/Flat file formats to record their data..
You would be surprised how many big (like household name) companies use Excel/Flat file formats to record their data..