Pst Viewer Pro is a professional tool for managing email in Outlook .PST files, even if MS Outlook is not installed on your Windows computer. A native 64-bit or 32-bit Windows, application, it is the choice of people who have important work to do with Outlook .pst files and has been downloaded more than a million times. Pst Viewer Pro takes you beyond Outlook PST files. It is six viewers in one! It can also read, search and export email formatted as .MSG, .OST, .EML, Winmail.dat and even .MHT files.