If you can’t access your emails in an OST file because it is corrupt, don’t fear you can still get your data back the right way. MHTML lets you open your emails and view them in any web browser. I suggest using WholeClear OST to MHTML Converter. It will allow you to open corrupt or inaccessible OST files (provide action access, attachments, formatting, etc) and convert all of the emails over to MHTML files in a short time frame—there is no need for Outlook or Exchange, and it only takes a few minutes! You simply add the OST file, select MHTML as the output format, and click convert. The converter even has a demo version, so you can check it out further.