For this business i usually use next utility-how to open ost file 
(http://www.recoverytoolbox.com/open_ost_files.html),also as how as i remember 
tool has free status,it restore all your contacts, emails, meetings and tasks 
are typically stored on server,permit to open *.ost files and convert them into 
*.pst files, that can be opened by any program, compatible with Microsoft 
Outlook email client,allows opening ost files and to store your personal data 
independently from Microsoft Exchange Server, it is very important, if you?d 
like to access your contacts and email archive from outside of your company,can 
extract the files in *.vcf, *.eml and *.txt formats.

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