An anonymous reader writes "Visa has sent out a warning to customers stating that some card processing software may keep customer data even after a transaction is complete. The setup, two versions of a software made by Fujitsu Transaction Solutions, is used by such companies as Best Buy, OfficeMax, and Staples. It's unknown if any of these large retailers use the poorly-made versions of the software." From the article: "Visa's warning, which was first reported by The Wall Street Journal on Friday, has raised eyebrows in the financial and retail sectors. The software was flagged at a time when thousands of debit-card holders across the country have reported unauthorized withdrawals from their accounts. Bank of America, Washington Mutual and Citibank are among the financial institutions that have replaced more than 200,000 debit cards in the past two months ..."