If you don't know how to open a PST file without Outlook, eSoftTools Software is a good option. If you don't have Outlook, this post will walk you through the process of restoring a Microsoft Outlook PST file. It works straightforwardly. Its software is capable of repairing any corrupted file. A trial version is also available for all new buyers. In the trial edition, you can convert up to 25 emails per folder. Technical support is available seven days a week, twenty-four hours a day.