A few weeks before I faced issues with bulk duplicates of Mbox files and increased the Jung file size To deal with this issue first I tried the manual method for deleting the duplicate files but that was a very difficult task to do method then I was searched on the google for a direct solution to delete duplicates from Mbox files then I found the Mailsclick MBOX Duplicate Remover Tool to find and delete duplicates from MBOX files. Users can directly work with Apple Mail, Eudora, Entourage, Spicebird, etc. email clients. It can dislodge all Mbox duplicate files in straightforward steps and instantly delete duplicates from Mbox files. It can easily handle multiple Mbox files. Users have the option to select a new location to save fresh files. New Users can use the free demo to operate the features of the tool. Now you can install MBOX Duplicate Remover to remove or delete bulk MBOX files and get the best solution.

To convert an OST file to PST format without Outlook, you can use third-party software that supports you in creating an OST file into PST format. For this conversion, you can utilize ToolsBaer for OST to PST Conversion Software. With the help of this application, you can easily convert your bulk OST file to PST format in a few simple steps. Moreover, all versions of MS Windows are compatible with this software, so you can easily run this utility on any computer system. To learn more, you can download the free demo version of this program.
Know more: https://www.toolsbaer.com/ost-to-pst-conversion/

My recommendation is to use CubexSoft MBOX to Gmail Converter software for quickly export batch MBOX files to 25+ saving options without any loss of data and file corruption. The software support to save MBOX files with attachments to various popular platforms like NSF, PST, PDF, MBOX, MSG, Office 365, Gmail, G suite, Exchange Server and many others. To get more information regarding MBOX Converter, you can download demo edition. With demo edition, you will get free export of upto 25 MBOX files in any desirable file format.

Shoviv's IMAP to IMAP Migration tool facilitates seamless migration of Gmail emails to Outlook.com. This user-friendly tool securely migrates emails, preserving folder structures, attachments, and metadata. By leveraging IMAP protocols, it ensures a direct and efficient migration process. Users can confidently migrate their Gmail data to Outlook.com, minimizing downtime and maintaining data integrity throughout the migration.

Read more - https://www.shoviv.com/blog/how-to-migrate-gmail-to-outlook/

If you want to transfer Office 365 Mailbox to another account then you can also consider the Shoviv Exchange Server Suite.

Read more: Microsoft Office 365 Tenant to Tenant Migration

If you're seeking a Free way to convert NSF files to Outlook PST format then i suggest you to use the professional DataVare NSF to PST Converter software, because it's easy to use and safe for for data as compared to free tool. The NSF Converter tool is the best for creating Microsoft Outlook PST files from Lotus Notes NSF files. Data can be moved from Lotus Notes to Outlook or another program using this method. Emails, contacts, calendar entries, tasks, and other data may be effortlessly transferred from Lotus Notes to Outlook with the help of this powerful tool. Both technical and non-technical individuals can readily handle the software due to its user-friendly interface.