Tool To convert outlook ost files to pst files supports OST file which are created on Microsoft Exchange 5.0, 5.5, 2000, 2003, 2007 and 2010. This software is also capable to recover all Outlook contacts, emails, folders, notes, journal, appointments etc. OST to PST converting software can convert encryption, compressed files and password protected OST files. This software is the safest and securable way to converts OST files to PST files.