If you're looking for an OST to Office 365 Converter tool, SysInspire is a reputable brand for OST recovery and OST conversion. The SysInspire OST to Office 365 Converter tool provides some simple steps to convert an OST file to Office 365, including all OST mailbox items such as emails, tasks, notes, journals, calendar, contacts, and many other files. To, From, CC, BCC, and Subject are all eta properties. Use the free trial version to get a feel for the product.
Read More:- Convert OST File to PST
OST file used when user contact exchange server for email some times there are so many resign to corrupted exchange server and ost file is not used for user to view email dux data recovery ost to pst converter software on the best software to convert ost file data in to a pst file dux data recovery support all the version of the ost file. for more info https://www.duxdatarecovery.com/ost-to-pst-recovery.php