My Outlook profile became inaccessible, and I needed a way to convert OST to PST without Outlook. Manual methods were complicated, slow, and required Outlook installation. Later, I used the DRS Softech OST to PST Converter, which safely converted all my emails, contacts, and attachments while keeping the original folder structure and formatting intact without any data loss. https://www.drssoftech.com/blog/convert-ost-to-pst/