well & good technique in the online market that’s name is Atom TechSoft OST export tool to fix & convert OST to PST file with its all attachments like - Inbox, Outbox, Sent Box, Delete items along with fastly save outlook offline OST file into various extensions such as – PST, MSG, EML and HTML file formats.
Read More :- http://www.atomtechsoft.com/outlookosttopst.html