Download MS Outlook to Thunderbird Convent Software to transfer mailbox from MS Outlook PST file to Thunderbird MBOX file format.
This software is not reviewed yet.
Download OST to PST Converter software to convert emails from Exchange Server OST to PST file format. Download Free OST converter to test OST file converter.
Pst split software is available to divide or to split huge data or unlimited pst data by yearly, by size, by folder. Splits PST files into smaller ones and helps avoiding PST corruption.