Great solution of OST to office 365 migration tool from KDETools software. This is the easy way to migrate data from OST to Office 365 but firstly recover OST mailbox like emails, inbox, sent the item, draft, delete-items, attachment, calendar, notes, task (To, Cc, Bcc, Date, From, Object and Time). This OST to Office 365 converter software to convert large OST file in smaller parts of OST file and also transfer OST to Office 365 account.

OST to Office 365 Migration Tool
http://www.osttopst-converter.com/bl...ffice-365.html