No problem ,for this solution is available .This is Atom TechSoft ost to pst converter software tool and use it .It will convert old ost to new pst outlook .After that open this converted ost on outlook as pst .
I mean convert ost to pst to open into new outlook .
It support all version of ms outlook :- ost 2016 ,ost 2013,ost 2010 ,ost 2007 ,ost 2003 ,ost 2000 ,etc .
Ask query :- email@example.com
Go for software :- http://openosttonewcomputer.emyspot.com/