I am unable to access my emails in MS Outlook due to some error in Offline OST file. Please suggest me how can I get back my all emails from OST data and convert to PST file format.
I don't know if that would do, but can you try copying the the same files to some other system and try accessing them. If it is Outlook database, I suppose, that would be supported by Outlook Windows on other systems as well.
I got to learn that OST files are not read by Outlook. You should look out for some third party applications that can read these OST files and can convert them to PST
I recommend a most secure method. There won't be any other solution that can work with full precision. Follow these smart approaches to import your OST file into PST in desired file format.
A step-by-step manual for the conversion of Exchange Server OST files to Microsoft Outlook PST files. This instruction helps to convert OST to PST files with all messages, contacts, appointments, tasks, notes, journals, calendars and so on: