EML to PST conversion requires a program that efficiently manages folder hierarchy, read / unread state, inline images, and attachments to a PST file. Therefore, I would like to recommend MailsDaddy EML to PST Converter. It is one of the secure methods to export EML file in PST file format. Users can use tools on a variety of EML-based email clients such as Apple Mail, Entourage, Windows Live Mail, Outlook Express, Thunderbird, and others. The software supports all Window OS's so users don't have to try too hard to open EML file in Outlook.
To use the demo version go to the official site which allows you to change 20 emails / mailboxes.