If you are trying to convert multiple EML files to PST then the easiest way is to use an expert tool instead of doing it manually. I have personally used Toolsbaer EML to PST Converter and it worked great for me. It lets you convert bulk EML files into a single PST file without losing any attachments. This tool preserves email attachments and data integrity during the process and supports several email apps such as Windows Live Mail, Windows Mail, Outlook Express and more. The interface is easy to use just add your EML file or folder, choose the destination path and click convert. It is also compatible with all Windows editions.