Convert OST to MSG: Extract Outlook Emails to Individual Files
Converting OST to MSG extracts individual emails from an Outlook offline data file into separate MSG files you can open in any Outlook version. The Turgs OST Converter Wizard handles this without needing Outlook installed, supports batch conversion of multiple OST files and preserves all email metadata and attachments. Free trial converts 25 emails.
An OST file is Outlook’s offline cache. It is encrypted and tied to the Exchange account that created it.
If that account is gone, the mailbox is deleted or you cannot connect to the original Exchange server, you still need those emails. Converting OST to MSG breaks each email out into a standalone file you can open, search and forward from any Outlook installation.
This guide covers how to find your OST file, understand when OST to MSG conversion makes sense and how to complete the OST to MSG conversion step by step.
Where Is Your OST File Located?
Before you can convert, you need to find the OST file on your system.
Windows Vista and later (default path):
C:Users[Username]AppDataLocalMicrosoftOutlook
Windows XP (default path):
C:Documents and Settings[Username]Local SettingsApplication DataMicrosoftOutlook
You can also find the exact location from within Outlook:
Step 1. Open Outlook and click File in the top panel.
Step 2. Go to Account Settings then click Account Settings again from the dropdown.
Step 3. In the Account Settings dialog, click the Data Files tab. Your OST file path is listed here. Click Open File Location to open the folder directly.
When Does OST to MSG Conversion Make Sense?
Converting OST to MSG is the right choice when you need individual emails as portable files. Common reasons:
- Your Exchange account was deleted and you cannot reconnect the OST
- You want to forward specific emails to a new account as attachments
- Legal or compliance teams request specific emails as separate MSG files
- You are migrating to a new email system and need selected emails preserved independently
If you want to import the entire OST mailbox into Outlook, converting OST to PST is a better approach. MSG is the right format when individual emails matter more than folder structure.
How to Convert OST to MSG Without Outlook
Download and install the Turgs OST Converter Wizard on your Windows PC. The free trial converts 25 emails per OST file so you can verify the MSG output before purchasing.
Step-by-Step: OST to MSG Conversion
Step 1. Launch the Turgs OST Converter Wizard. Click Add File or Add Folder to load one or more OST files.
Step 2. The tool analyses the OST file and displays the folder tree. It shows a preview of emails in each folder.
Step 3. Select the folders or individual emails you want to convert. You can tick the box next to a folder to select all emails in it, or expand the folder and select individual messages.
Step 4. Click Convert and select MSG from the saving format list.
Step 5. Choose a file naming convention for the exported MSG files. Options include Subject, Date, Sender and a combination of these.
Step 6. Set the destination folder where the MSG files will be saved.
Step 7. Click Convert to start. A live progress bar shows how many emails have been converted.
Step 8. When conversion is complete, the tool opens the destination folder automatically so you can verify the MSG files.
What Does the OST Converter Preserve?
Each exported MSG file retains:
- Email body including HTML formatting and inline images
- All attachments embedded in the original email
- Full headers including To, From, CC, BCC, Subject and date
- Folder structure replicated as subfolders in the output directory
One thing the MSG format cannot preserve: read or unread status. All exported MSG files open as unread emails unless you manually mark them.
OST vs MSG: Key Differences
| Feature | OST | MSG |
|---|---|---|
| Contents | Entire mailbox (emails, contacts, calendar) | One single email message |
| Accessibility | Requires Outlook + Exchange account | Opens in any Outlook version |
| Portability | Not portable | Single file, easy to share |
| Encryption | Encrypted by Exchange | Not encrypted |
| Use case | Offline mailbox cache | Email archiving and sharing |
If you need a different output format, the OST file troubleshooting guide covers common OST errors. And for migrating a full mailbox rather than individual emails, the PST to Exchange migration guide is worth reading first.
Are you converting a single OST from one deleted account, or do you have multiple OST files from several users to process at once?
Frequently Asked Questions
Can I convert OST to MSG without Microsoft Outlook installed?
Yes. The Turgs OST Converter reads and decrypts the OST file directly without needing Outlook installed on the same machine. You only need Windows.
Does the tool handle orphaned OST files from deleted Exchange accounts?
Yes. Orphaned OST files (where the original Exchange account no longer exists) are the most common use case. The converter opens the OST directly without needing an active Exchange connection.
How many OST files can I convert at once?
The tool supports batch mode. Load multiple OST files using the Add Folder option and the converter processes them all in sequence.
Will corrupt OST files convert correctly?
The converter includes a recovery mode for damaged OST files. Most corrupt OST files contain recoverable data that the tool can extract even if Outlook refuses to open them.
Is there a limit on OST file size?
The licensed version has no size restriction. OST files up to 20 GB convert without issues. The free trial version converts 25 emails per file regardless of size.
Can I open the exported MSG files on a different computer?
Yes. MSG files are self-contained. Double-click any MSG file on a Windows PC with Outlook installed and the email opens exactly as it was in the original OST file.
