By using the SysInspire PST Converter software you can open PST files without Outlook. They can recover your mailbox items like emails, contact, appointments, and calendar, etc and convert them into other formats like EML, EMLX, MSG, HTML, Zimbra, vCart, and VCF, etc. On which you can extract large files without any stoppage, it has no size limit extraction. On the free demo version, you can export 25 emails from each mailbox.

Read more:- Technique to open PST file without Outlook