Automated static code analysis is an efficient technique to increase the quality of software during early development. This paper presents a case study in which mature software with known vul-nerabilities is subjected to a static analysis tool. The value of the tool is estimated based on reported failures from customers. An average of 17% cost savings would have been possible if the static analysis tool was used. The tool also had a 30% success rate in detecting known vulnerabilities and at the same time found 59 new vulnerabilities in the three examined products.