Try PST to MBOX Converter Tool to outlook save email as MBOX file format with all details and attachments. This software can migrate Outlook PST files to MBOX based email clients without having any problems. It has very simple GUI, so technical or non-technical users can easily handle and works with software without having any problems. During the outlook save email as MBOX process, the software maintains all the folder structure without any data loss. MS Outlook installation is not required for migration process. With preview facility, you can view all the loaded data before final conversion process. It supports MS Outlook and Windows OS. You can also try free demo version of the software without any cost.