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Looking for the best MBOX converter tool for Windows OS. Try MailsDaddy MBOX Converter tool to load and export data from MBOX-based email clients to Outlook PST format at once. The application manages internal and external folder structure during the whole migration and allows user to move data at once.
This single GUI tool has several features and export option. User can install the application in all Windows OS and easily migrate data from MBOX to PST, EML, MSG, PDF etc. 

Read more: MBOX converter
How to Convert MBOX file
Which is the best MBOX converter tool

If you want to migrate sharepoint data then you can contact MailsDaddy software. It has multiple solution and services to transfer organization data from one platform to another platform.
https://www.mailsdaddy.com/thunderbird-to-outlook-converter/
https://www.mailsdaddy.com/blogs/google-workspace-backup/
https://www.mailsdaddy.com/blogs/migrate-from-google-workspace-to-office-365/
https://www.mailsdaddy.com/blogs/office-365-tenant-to-tenant-migration/
https://www.mailsdaddy.com/blogs/import-mbox-outlook-full-accuracy/

Mozilla Thunderbird stores data in MBOX and Maildir file format so when a user want to transfer their items from MBOX to PST, Office 365, EML, MSG etc. then professional application is required.
On the web, you can easily find lots of application tools but the most prominent solution is MailsDaddy Thunderbird to Outlook Converter tool. This single GUI tool has several features to open and migrate data from Thunderbird to Outlook PST format. The application keeps mail properties, email, attachments, meta data etc. during the whole conversion. User ccan also select the free demo edition first and move few emails from each folder.

Steps to Export Thunderbird to Outlook
Download,install and run the program on your Windows system
Click on Auto-load or press Add button to load mailbox.
Click on Export button to initiate batch migration
Choose PST for Outlook and save the destination then hit on export button.

Read more: PST from Thunderbird

MailsDaddy Office 365 Migration Tool is the best solution to directly import Office 365 mailbox to another Office 365 account. This single application keeps all mail formatting, header, inline images, attachments etc. during the whole conversion. User can install the software on all Windows operating system and migrate entire mailbox from Office 365 source to destination. The demo edition of the software exports up to 20 emails from each folder. Office 365 Migration Tool

Also offers: SharePoint Migration, Google Workspace Backup, Teams Migration, OneDrive Migration etc.