Like condition I resolved some time ago through next tool-
how to open an ost in outlook,which helped my friends too,it is free as far as I know,besides that program has many good admissibilities such as it open ost file in Outlook 2003 and recover your data from these encrypted *.ost files,it allows to move *.ost files to *.pst ones fast and easy,it has two recovery options, first of all, you can move your *.ost file to a *.pst file, the last one can be easily opened by Microsoft Outlook or any other compatible email client.