Deployment of Secure Messaging (SM) in primary care and women's clinics throughout the Veteran Health System by 2011 was an implementation priority for the Secretary and Under Secretary for Health for FY11 under the VHA T21 initiative. Secure Messaging is in early phases of implementation, this eHealth tool requires thoughtful evaluation to promote the successful implementation and dissemination of this tool. The primary aim of this project is to describe Veterans' experiences when using the SM feature on MyHealtheVet (MHV). This project has local, VISN, and national impact on the implementation and sustainability of the SM feature on MHV through its qualitative and quantitative examination of users' experiences. Findings from this research explores why Veterans choose to, or not to, use the SM feature on MHV, identify facilitators and barriers, and examine if experiences differ by health literacy or computer literacy. In addition to the interview data, findings from the usability testing and the quantitative survey findings build knowledge about Veterans' experiences using the SM feature on MyHealtheVet. These data will inform systems improvements, educational approaches, and marketing strategies to increase adoption and long-term utilization among Veterans.