=11ptIf you can't open OST file directly in Outlook and need How to open exchange OST file in Outlook? You may convert OST file to PST
for easily opening in Outlook with SysInspire. For this conversion there is one professional third party tool available i.e., SysInspire is certified with the great user Experience Award. It convert easily OST file to multiple formats like: Office 365, EML, EMLX, MSG, HTML, PST etc.
More info:- Convert OST to PST