Corbett
Corbett OST to PST Converter turns orphaned, offline, inaccessible and corrupted OST files into Outlook PST. Exchange profile, Exchange server and Outlook are not required. Emails, tasks, journals, notes and attachments keep HTML formatting, inline images and folder order. Bulk jobs, filters and IMAP profile export are built in, along with a trial edition.
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Processing stays on this PC and Corbett receives nothing.
Free demo, scanned clean on VirusTotal and a 30-day money-back window.
Lifetime licence from $99 Demo converts 10 items per folder
PST facts
An OST file is a replica of an Exchange mailbox, so Outlook opens it only with the profile and server that made it. This tool lifts that lock and hands back a PST that any Outlook version imports.
Preserved in the PST
OST states handled
Output choices
Not needed
Why OST Mail Needs a PST
When an Exchange account is deleted or a profile is rebuilt, the OST file becomes an orphan and Outlook refuses to open it. A PST is an ordinary Outlook data file, so the mail returns to a working profile.
Core features
Install, browse to the OST file, choose PST and save.
Install
Get the setup file, run it on Windows and open the program. It begins at OST file selection.
Folder selection
Add the OST file from disk, or open Email Data Files and choose Outlook to list every configured profile.
Message preview
Preview the full file inside the software panel, which lets admins verify the mail before export.
Selective backup
Narrow the run by name, subject, sender, recipient, date range, time to the minute, attachments, file name and file size.
Output options
Mark the PST radio button and click Save. When the run ends, open the finished PST file to confirm the result.
Before converting
Three short checks make the PST import smooth.
Source file
Copy the OST
Shut Outlook, locate the OST in its data folder and make a backup on a safe drive first.
Item scope
Everything or a slice
Convert complete folders in a single pass, or set date, time and field filters if only a share of the mailbox is needed.
Offline activation
Keep the key email
The activation key arrives by email and works offline, so the PC running the conversion needs no internet link.
The finished PST joins Outlook through Import PST to Outlook and Open PST file.
Free demo
Free Trial of Our PST Export
The free demo handles 10 items per folder and matches the full version in every other way.
Download free demoBefore purchase
Outlook can export an OST to PST only while the matching profile is alive. Once the server or profile is gone, the manual path ends. The table compares both.
| Task | Outlook export | Tool |
|---|---|---|
| Cost | Free | $99 one time |
| Active Exchange profile | Export through Outlook | Works too |
| Orphaned OST | Cannot be opened | Loads and converts |
| Corrupted OST | Stops with errors | Exports readable data |
| Folder order | Often reshuffled | Kept as in the source |
| Bulk jobs | One profile at a time | Batches of OST files |
| Filters | Basic search only | Date, time, name, subject, size |
| IMAP accounts | Not offered | Direct upload |
Only the green row works without the tool.
Contacts alone come out with Extract contacts from OST file .
Specifications
Download details
System
Supported editions
Windows 11 (64-bit), 10, 8 and 7 in 32-bit or 64-bit, plus Server 2016, 2012 R2 and 2008.
Start with Run as Administrator. OST files from Outlook 2000 to 2021 work in 32-bit and 64-bit builds.
Corbett has built Windows email utilities since 2020. Phone and chat support runs 24x7.
Working process
Prefer text steps? The Import PST to Outlook post shows how to bring the PST into Outlook.
Common questions
Steps, size limits, orphaned files and activation.
Download and install the software, browse the OST file into the panel and preview it. Apply any advanced settings needed, choose PST format and click Save.
Yes. Several OST files convert to PST format in one go.
No. Lab tests show the tool working with terabytes of data.
No. The software converts OST files to PST without Outlook installation.
Yes. Orphaned OST files convert, and no Exchange server connection is needed.
The demo exports 10 items per folder with all attributes. The full version has no restrictions.
No. Enter the activation code sent to the registered email address to activate the tool offline.
Yes. Select Desktop email client, then Outlook. All configured IMAP profiles load into the panel, and the PST radio button starts the export.
No. OST to PST conversion works without any Exchange server link.
No. A licence (Personal, Business or Enterprise) is needed. The free demo exports only 10 items per folder.
Yes. The interface explains itself, so no outside help is needed.
Windows 11, 10, 8 and 7 in 32-bit or 64-bit, plus Server 2016, 2012 R2 and 2008.
Automatic. Once payment is confirmed, an email arrives with the installer link and the activation key.
Support by phone and chat is open 24x7.
Yes. HTML formatting, inline images and image quality are retained.
Step by step
Posts on opening OST files and using the PST afterward.
Using the PST
Mail and contacts in OST
Hosted account moves use the Email Migration Tool . Server cutovers use the IMAP Migration Tool. More formats are covered in the email converter tool. Broken archives belong with the email recovery software. A viewer for mail files is part of the email viewer software. Same family: OST to PDF Converter and OST Converter Software. Also see the PST File Converter Tool, OLM to PST Converter, MBOX to PST Converter, MSG Converter Tool and Office 365 Backup Tool.
User testimonials
Rated by 1,999 users who processed OST files with Corbett.
Collected across 1,999 reviews gathered from portals and email, left as sent.
I am really happy with this offline OST to PST converter tool. I had to convert multiple OST files into PST format. After scourging the internet for while, I came upon this application. Suffice it to say, I’m satisfied with the tool.
This software has a pretty simple UI that made by conversion much easier than I though I would be. And boy its quite fast, too. Exported all my 300 OST files under a couple of minutes. Easy to use GUI will help home users as well.
I used this Best OST to PST Converter application upon the suggestion of a colleague. So far it has been working fine. I would recommend all anyone to go with this app if they have to convert offline OST file to PST file format. Free demo version helps to understand features.
Get started
Check the PST from the demo in Outlook using a spare OST. The licence costs $99 once.
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47.6 MB · Windows 11 and Server editions · $99 licence