Email Viewer Software was founded in 2005 in Minnesota by Darren Leno, a former Microsoft Product Manager. It focuses on improving email experiences through encryption, file management, and search/viewing software. The company's Pst Viewer Pro and Pst Viewer Lite products allow users to open, view, search, and export various email file formats without needing the full Outlook client. Pst Viewer Pro has been in use since 2006 by large companies and governments with over 100,000 installations.