MS Outlook Help provides a wide range of software that includes data recovery and email migration. There are some tools like OST to PST converter, PST Repair, PST Splitter, etc.
MBOX Importer Tool allows to import MBOX file into different file formats
EML Converter for Mac Export EML File into Outlook PST, MSG, and MBOX
Outlook PST Merge Tool merges your Outlook data files with mail attachments.
Outlook PST Compact tool to compress large PST files with attachments
OST File Splitter Tool allows you to split OST files based on the Date Filter
Office 365 Email Backup Tool Backup And Restore Mailbox Of Office 365
MBOX Converter for Windows to Export MBOX files to PST with attachments.
Gmail Backup Tool Export Gmail Emails to PDF with ease