I faced the same issue when I couldn’t access my OST files after an Exchange crash. I used BitRecover OST Converter, and it worked perfectly. Here’s what I did:

1. Installed and launched the software on my PC.

2. Added my inaccessible OST files using the Select Files option.

3. The software automatically scanned and displayed all my mailbox items.

4. I previewed my emails and attachments to check the data.

5. Selected PST as the output format and chose a saving location.

6. Finally, clicked on Convert, and within minutes, I had all my emails restored in PST format.

It was quick, secure, and I didn’t lose any data during the conversion.