New Delhi, India, 09 September 2026 — ViceVersa Tools has released its Thunderbird to MSG Converter, a desktop application that exports mail stored in a Thunderbird profile into individual MSG files, the format used by Microsoft Outlook.
The tool operates in a single direction, converting Thunderbird data into MSG files. It does not convert MSG files back into Thunderbird format. According to the company, this reflects how the format pair is typically used: organizations and individuals moving from Thunderbird to Outlook generally require a one-time export rather than ongoing conversion in both directions.
Thunderbird and Outlook store mail using different underlying formats, which has historically required users to rely on manual export methods or third-party utilities when switching between the two clients. Mail client migrations of this kind occur across a range of contexts, including individual users changing email software, organizations standardizing on Microsoft Outlook as part of broader IT infrastructure decisions, and cases where mail records need to be transferred to systems that read MSG files but not Thunderbird's native format.
The Thunderbird to MSG Converter reads a Thunderbird profile directly, without requiring Thunderbird to remain open during the export process. Users select the folders to be converted, and the resulting MSG files retain the same folder structure present in the original Thunderbird profile, rather than being consolidated into a single output location. Message content and formatting are preserved during conversion, according to the company.
The release adds to ViceVersa Tools' existing catalog of format-specific conversion utilities, which includes tools covering PST, EML, EMLX, MBOX, NSF, and TGZ formats, in addition to tools designed for Microsoft 365 migration. Some tools in the company's catalog convert data in a single direction, reflecting typical one-time migration scenarios, while others support conversion in both directions for use cases involving ongoing data transfer between two formats or platforms.
The company stated that the distinction between one-way and two-way tools in its lineup is based on common usage patterns for each format pair, rather than a uniform approach applied across all products.
The Thunderbird to MSG Converter is available for Windows operating systems, including Windows 7 through Windows 11. A free trial version is available, allowing conversion of a limited number of items before purchase. A personal license is available for continued use beyond the trial period.
About ViceVersa Tools
ViceVersa Tools develops mail conversion and migration software covering formats including PST, EML, EMLX, MBOX, NSF, TGZ, and MSG, along with tools built around Microsoft 365. The company's catalog includes both two-way converters and single-direction export tools, depending on the format pair and the migration pattern it is designed to support. More information is available at viceversatools.com.
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