Excellent and most reasonably priced utility for converting Outlook PST files to MBOX files is
DRS PST converter software. Conversion into multiple file formats, including EML, MBOX, PDF, EMLX, HTML, MSG, VCF, and others, is best accomplished with this program. With a functional demonstration, it enables users to migrate Outlook PST data into Gmail, Yahoo, Opera Mail, Thunderbird, IMAP, Hotmail, etc. Installing Microsoft Outlook on a computer is not required. It can preview all mailbox folders, subfolders, and attachments in addition to importing PST files into Google Workspace. With every Windows OS version, PST Converter functions well.