How Do I View Old OST Files?

Microsoft Outlook stores mailbox data in two primary formats: OST (Offline Storage Table) and PST (Personal Storage Table). OST files allow users to work offline and sync changes when reconnected to the mail server. However, when an Outlook profile is deleted, an Exchange account is disabled, or you move to a new system, accessing old OST files becomes challenging.

If you're wondering, "How do I view old OST files?", this guide is for you. We'll cover everything from understanding the file type to practical tools and methods for opening and extracting data safely using OST to PST Converter.

Understanding OST Files

An OST file is created when Outlook is configured with Exchange, Office 365, or IMAP accounts. It stores a synchronized copy of your mailbox locally, allowing offline access to emails, calendar, and contacts.

OST vs PST: Key Differences

• OST files are tied to server-based accounts and can't be imported into another Outlook profile.
• PST files are used for backups, exports, and POP3 email accounts and can be moved and opened freely.

Why Access Old OST Files?

Common scenarios include:

• Deleted Outlook profiles or deactivated accounts.
• Migration to a new computer.
• Server inaccessibility.
• Data recovery from crashes or corruption.

Challenges in Accessing Old OST Files

1. Outlook Limitations

You can't open OST files directly in Outlook without the original profile. They’re profile-bound and non-portable.

2. Orphaned Files & Encryption

Disconnected (orphaned) OSTs are often encrypted. You can’t open them unless you recreate the original profile or convert the file.

3. Common Errors

Typical errors include:

• "OST file is not an Outlook data file."
• "Cannot open the Outlook data file."
• "The file is in use and cannot be accessed."

Methods to View Old OST Files

1. Manual Method (With Active Profile)

If you still have access to the original Outlook profile:

1. Open Outlook > File > Open & Export > Import/Export.
2. Choose "Export to a file" > Next.
3. Select "Outlook Data File (.pst)" > Next.
4. Choose folders to export > Set destination > Finish.

Limitations:

• Requires active profile.
• Won’t work on corrupted OSTs.
• Requires some technical knowledge.

2. Automated Method (Best for Orphaned or Damaged Files)

If you have saved an old OST file for backup and profile get deleted or no configured Outlook profile. So, we recommend you to choose BitRecover OST Converter as this software can easily restore and convert damaged, corrupted, inaccessible and oversize OST files.

Steps:

1. Download and open automated software on your system.
2. Click on Convert configured Outlook mailbox data as needed.
3. Choose the OST mailbox folder and subfolder as you want to export.
4. Browse filter options and choose PST file in the list of Saving options.
5. Browse destination path and press Convert button to access old OST files.

Benefits of Automated Approach

• This software can convert OST to PDF, PST, EML, MBOX and 37+ Saving features.
• With this wizard, you can also use filter options to convert selective data as per date range, subject, sender, recipients and also helps you to avoid unnecessary data.
• It offers you to import OST to Microsoft 365, Thunderbird, Zimbra and all IMAP Supported mail servers.
• You can easily operate this software as it comes with an easy to navigate interface to make it reliable for all types of users.
• This software offers you to restore and convert corrupted, inaccessible, damaged and oversized OST files.

Conclusion

Accessing old OST files doesn’t need to be difficult. If your file is healthy and tied to an existing profile, the manual Outlook export method may suffice. However, for orphaned, encrypted, or corrupted OSTs, automated tools offer a safer, more comprehensive solution. Choose the method that fits your scenario to retrieve and preserve your important Outlook data without hassle.