An ost file is the synchronisation file created usually when you are using a laptop to enable you to check e-mails when you are off-line. It usually synchronizes your inbox, calender, contacts and sent items but these can be changed if needed.
You cannot just change an ost file to become a pst file. you can however create a pst file from the data in the offline mailbox. You could try and create a new profile and then when you allow for synchronising, point to the old ost file which may help you out.
Also, please note that you should get used to creating ost/pst files etc in folders which ar NOT in you profile folder. This will prevent the profile from becoming too big and thus becoming corrupt.
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