We have an excellent eSoftTools OST to PST converter tool that perfectly recovers Exchange file from OST file with attachments and shows the view of all things Exchange knowledge base-files like journals, errands, notes, schedules, contacts and can split enormous PST files into different PST files. It can easily export OST to PST file format without any changes in its data. User can also try its free trial version in which user can convert the initial 25 items from ost to pst.
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Take advantage of sysInspire best OST to PST Converter Software, which allows you to save OST file database items to PST, EML, EMLX, MBOX, Zimbra, Gmail, MSG, Yahoo, and HTML formats. This programme imports all data from an OST file into a PST Outlook file or Office 365 account, including emails, draughts, addresses, attachments, calendars, notes, and more. It converts OST files with complete accuracy and provides 100 percent happy performance. You can easily split your big PST file into many smaller pieces.
Here is the solution to OST is in use and cannot be accessed