Free Download SysTools OST Viewer Pro Plus 4.0 | 57 Mb
The OST Viewer Pro+ allows users to open and read all the items from OST such as emails, calendars, contacts, journals, etc. Along with that, the associated data like metadata, fields, and attachments can also be scanned and viewed. In fact, there is an option to add more then one OST file of ANSI or UNICODE type and of any size separately.

https://www.systoolsgroup.com/ost-viewer-pro/plus.html