Sifo systems ost to pst converter tool is safest application to do ost recovery because via this tool you can recover any of ost file with unlimited size .
And also can convert ost to pst .
It has good programming script that software use internally for recovery and conversion of outlook ost file .It move ost file to pst with all data like as inbox,calendar ,notes,contacts,task,etc .
It has great working over all version of outlook ost file such as ost 2016,ost 2013,ost 2010,ost 2007,etc .
Go for free download of software ,
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Sifo systems ost to pst converter software