GainTools Adds MBOX to PST Converter for Bulk Email Migration to Outlook

GainTools introduced an MBOX to PST converter for moving email from Thunderbird, Apple Mail, Entourage and other MBOX-based clients into Microsoft Outlook, the company said in a PRLog announcement published November 11, 2026. The software runs on Windows 7 through Windows 11.

How the GainTools MBOX to PST Converter Works

The converter loads MBOX files or folders, previews the mailbox data, lets users select the items to export, sets PST as the output format and asks for a destination location. Bulk conversion processes multiple MBOX files in a single run, and selective file conversion lets users navigate to and choose the files they need. The tool retains original email properties, folders and mailbox items during conversion.

Output can be split or combined. A separate PST file can be created for each MBOX file selected, or multiple MBOX files can be consolidated into one PST. The software also finds and removes duplicate mailbox items during conversion, and GainTools describes the interface as usable by both technical and non-technical users.

"We strive to make email migration easy and simple by delivering reliable and user-friendly software solutions," a spokesperson for the company said. The spokesperson said the converter offers bulk processing, selective conversion and flexible PST creation for mailbox migration.

GainTools' Earlier MBOX and Outlook Releases

Company records show GainTools launched MBOX to MSG Converter v3.0 in November 2025 with support for files up to 500 GB, improved Windows and Outlook compatibility, and flexible save-location options, according to akta.pro company records. The same records list an MBOX Converter v3.0 release in South Africa in October 2025 and a February 2026 update to its OST to PST conversion software with faster processing, improved data protection and batch conversion support.

The records describe GainTools as an India-based developer of email file format conversion and data migration software, founded in 2017, with more than 50 professional software solutions and more than 50,000 users worldwide.

Cloud and Office 365 Tools Released Before the Converter

GainTools released Cloud Migration Software 2.0 on October 28, 2026, enabling bulk cloud-to-cloud data migration with selective move and folder structure preservation, PRLog reported. The software supports 19 languages.

On October 27, 2026, GainTools launched Office 365 Backup Software 2.0, which enables selective backup of specific folders and multiple export formats including PST, EML, MSG, MBOX, HTML and MHTML, according to PRLog. In August 2026, PRLog reported the release of GainTools Merge PST Software, a utility that combines multiple Outlook PST files into a single file and consolidates emails, contacts and other mailbox data from various archives or accounts.