Denver, Colorado — September 8, 2026 — ViceVersa Tools has released the PST MBOX Switcher, a Windows desktop application that converts Outlook PST archives into MBOX format and reverses the process to bring MBOX files back into PST. The tool is available at viceversatools.com/pst-mbox.php and runs on Windows 11, 10, 8.1, 8, and 7.

The converter is built around a specific limitation in Outlook migrations: PST is a proprietary Outlook format, while MBOX is used by Thunderbird, Apple Mail, and several other mail applications. Moving mail between the two has typically meant having Outlook installed and configured on the machine doing the work. ViceVersa's tool reads and writes both formats directly, so the PST-to-MBOX direction does not require Outlook to be present, and the software is explicitly marketed on that basis.

Several details in the tool address problems that come up on real mailboxes rather than clean test files. Both ANSI and Unicode PST files are supported, including archived and password-protected PSTs. There is no fixed size cap on the PST files the tool will export, and a user can output a single combined MBOX file or split the result into multiple MBOX files depending on how the destination mailbox is organized. The full version includes a date filter, so specific ranges of mail can be included or excluded from a job, and users can add source files from more than one folder or drive within the same conversion rather than being limited to one directory. Loaded files can also be scanned and previewed before a user commits to running the export. Attachments are carried over with each message as part of the conversion itself rather than as a separate step.
In the MBOX-to-PST direction, the tool recognizes MBOX output from a set list of applications, including Thunderbird, Apple Mail, Google Vault, Eudora, and Entourage.

"The most common reason someone needs this isn't that they want to try a new format — it's that they're leaving Outlook, or inheriting a mailbox from someone who did, and the files on hand don't match the software they have," said a product lead at ViceVersa Tools. "We wanted the Outlook dependency removed from at least one side of that problem."
ViceVersa Tools offers the PST MBOX Switcher as a 25-item free trial, with a paid Personal license priced at $39 covering one machine and one year of updates.

Availability
The PST MBOX Switcher is available for trial download and purchase at https://www.viceversatools.com/pst-mbox.php.

About ViceVersa Tools
ViceVersa Tools builds desktop file-conversion software for people moving mail between systems that don't natively read each other's formats. Its products are built around individual format pairs rather than one general-purpose tool, and several — including this converter — are designed to run without the mail client tied to the source format installed on the machine. ViceVersa Tools' software is Windows-based and distributed directly from the company's website.

Media Contact
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Email: [email protected]
Website: https://www.viceversatools.com