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OST MSG
File conversion

Convert OST to MSG

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Is it possible to convert OST to MSG?
Yes - OST converts to MSG.

Export individual emails as .msg: from a working Outlook, open a message and Save As → .msg (or drag to a folder). From an orphaned OST, the same recovery tools that produce PST can also export messages to .msg/.eml.

1 programs
Also to MSG: PST · OFT · EDB

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert OST to MSG

Converting a .OST file to .MSG lets you open the content in software that prefers the .MSG format, though some details may change compared with the original. The programs listed below open .OST files and can save or export them to .MSG (or a closely related format). One of them is Microsoft Outlook: Outlook is one of the most popular apps providing email account management. It enables to integrate within a single place an email account, calendar, as well….

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

Programs that convert OST

Microsoft Outlook

About these formats

.OST Outlook Offline Storage Table

An OST file is the local offline cache Microsoft Outlook keeps for an Exchange, Microsoft 365, or IMAP account - a copy of your mailbox so Outlook works without internet. You don't open it…

Open .OST details →
.MSG Outlook Message (Microsoft Outlook saved email)

An MSG file is one email - with subject, sender, recipients, body, and any attachments - saved from Microsoft Outlook in Outlook's proprietary binary format. On Windows, double-click it in…

Open .MSG details →