In an effort to reduce costs, some developers consider an open source operating system. This paper identifies the true costs of this and important factors to consider. When integrating an OS into a product, especially an embedded system, a developer needs to be confident it will work as expected, with reliability and without defects. An open source OS may not have the testing and verifications that you require, leading to additional expenses. Security, maintenance and updates are all benefits from choosing Windows Embedded, an OS that has already proven its worth.