If you’ve ever dealt with Outlook OST files, you already know how frustrating they can be. An Exchange server goes down, a profile gets deleted, or Outlook simply refuses to sync — and suddenly your mailbox data is stuck inside an OST file you can’t open. This is exactly where an OST to PST converter becomes useful.
One tool that often comes up in this space is Stellar Converter for OST. In this review, we’ll take a closer look at what it does, how it works, and whether it’s actually worth using.
What Is Stellar Converter for OST?
Stellar Converter for OST is a utility designed to convert Outlook OST files into PST format. Once converted, the PST file can be easily opened or imported into Microsoft Outlook.
The tool is mainly used when:
- The Exchange server is no longer accessible
- An Outlook profile has been deleted
- OST files become orphaned or unsynchronized
- You need to migrate or back up mailbox data
What Can It extract from an OST File?
One thing Stellar does well is complete mailbox conversion. It doesn’t just pull emails, it extract almost everything stored in the OST file, including:
- Emails and attachments
- Contacts
- Calendars
- Tasks
- Notes and journals
The original folder structure is preserved, which makes navigating the converted PST file much easier once you open it in Outlook.
Key Features Worth Noting
Preview Mailbox Items Before Saving
Before converting the OST to PST, the software lets you preview all mailbox items in a structured tree view. This is helpful if you want to confirm the data is intact or if you only need to export specific folders instead of the entire mailbox.
Works with Encrypted OST Files
Even if the OST file is encrypted or password-protected, this OST to PST Converter Software can still read and process it. This is especially useful in corporate environments where mailbox security is enabled by default.
Multiple Save Options
Although PST is the main output format, the software also allows saving data in formats like:
- MSG
- EML
- RTF
- HTML
- PDF
This flexibility can be useful if you need emails for legal, compliance, or documentation purposes.
Batch Conversion (Technician Version)
If you’re dealing with more than one OST file, the Technician edition allows batch conversion. This can save a lot of time for IT administrators or managed service providers.
Export Directly to Office 365 or Exchange
Instead of converting to PST first, the higher editions allow you to export OST data directly to Office 365 or a live Exchange server, which is useful during mailbox migrations.
Automatic OST File Detection
The software can automatically locate OST files on your system, which is convenient if you’re not sure where Outlook stored them.
Ease of Use
Stellar Converter for OST is clearly built for non-technical users as well. The interface is clean, and the process is straightforward:
1. Select or Find OST File
The first screen you’ll see after launching the software lets you choose the OST file you want to convert.
- If you already know the location, click “Select Outlook File.”
- If you’re not sure where the OST file is stored on your PC, click “Find”
This opens a finder dialog where you can browse drives or search subfolders.
2. Preview the PST Files After Conversion
After the scan is complete, the software displays a detailed preview of the mailbox data. Users can view emails, attachments, contacts, calendars, and other mailbox items in a structured tree view.
This preview feature allows users to verify the data before saving it, ensuring nothing important is missed during conversion.
3. Use the Find Message Option to Search for Emails
To make reviewing large mailboxes easier, the software includes a Find Message feature. Users can search for specific emails using criteria such as sender, subject, or date.
This helps quickly locate important emails within the preview window, especially when dealing with large OST files.
4. Save the Converted File
Once the format and destination are selected, the conversion begins. The software processes the OST file and saves the data in the chosen format without altering the original file.
5. Conversion Completion
After the process finishes, a confirmation screen notifies you that the file has been saved successfully, along with basic details such as file size and save location.
Pricing and Editions
Stellar offers different editions based on usage needs:
| Edition | Suitable For |
| Corporate | Individual users converting OST to PST |
| Technician | IT admins and bulk OST conversions |
| Toolkit | Advanced conversion, recovery and migration needs |
A free demo version is also available, which lets you scan and preview mailbox data before purchasing.
Pros and Cons
Pros
- Converts inaccessible and orphaned OST files
- Maintains original folder structure
- Supports encrypted OST files
- Allows preview before saving
- Multiple export formats available
- Direct export to Office 365 and Exchange (higher editions)
Cons
- Some advanced features are limited to higher editions
Final Verdict
Stellar Converter for OST is a reliable option if you need to convert or migrate data from OST files in Exchange or IMAP accounts. It’s easy to use, handles complex OST scenarios well, and offers enough flexibility for both individual users and IT professionals.
If you’re regularly dealing with Outlook data conversion or mailbox extraction tasks, this tool can save you a lot of time and unnecessary headaches.
