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OST PST
File conversion

Convert OST to PST

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

The #1 task. If the account works, don't 'convert' - export in Outlook (Import/ Export → .pst). If the OST is orphaned (account/PC gone), use an OST-to-PST recovery tool (Kernel, DataNumen, Stellar, Aryson) that reads the binary directly. No free Microsoft tool converts an orphaned OST; the supported path is always re-sync or export from a live account.

1 programs
Also to PST: SBD · NSF · EDB

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert OST to PST

Converting a .OST file to .PST lets you open the content in software that prefers the .PST format, though some details may change compared with the original. The programs listed below open .OST files and can save or export them to .PST (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 →
.PST Outlook Personal Storage Table

A PST file is a Microsoft Outlook database that stores an entire mailbox in one file - emails, contacts, calendar appointments, tasks, and notes. The standard way to open it is Microsoft…

Open .PST details →