Here is the most advanced and Best MailsClick Convert PST File to MBOX tool is a combo of accuracy and power. It provides completely solution to Convert multiple PST files into MBOX file format by supported 20+ email client like Entourage, Mac Mail, Thunderbird, Windows Live Mail, etc.

Convert PST File to MBOX with Contacts, Calendar, Attachments, etc.
Save PST files in MBOX, EML, EMLX, VCF, MSG, etc.
Import Outlook PST mailbox into Office 365 cloud
Display preview of all mailbox items
Supported all version of MS Outlook and Thunderbird
Download totally free trial version Converts 10 emails from PST File to MBOX

Visit here:- mailsclick.com/convert-pst-file/mbox