This excerpt taken from the WBMD 10-K filed Mar 16, 2006.
Implementation of changes in hardware and software platforms used to deliver our online services may result in performance problems and may not provide the additional functionality that was expected
From time to time, we implement changes to the hardware and software platforms we use for providing our online services. During and after the implementation of those changes, a platform may not perform as expected, which could result in interruptions in operations, an increase in response time or an inability to track performance metrics. Any significant interruption in our ability to operate any of our online services could have an adverse effect on our relationships with users and clients and, as a result, on our financial results.
We rely on a combination of purchasing, licensing, internal development, and acquisitions to develop our hardware and software platforms. Our implementation of changes in these platforms may cost more than originally expected, may take longer than originally expected, and may require more testing than originally anticipated. In addition, we cannot provide assurance that changes in these platforms will provide the additional functionality and other benefits that were originally expected.