Here is the easiest method name of Outlook OST to PST Converter from KDETools technology which simply works to conversion from OST to PST and also all MS Outlook OST file items like emails, contacts, chats, tasks, notes, journals, and appointments etc. The converter tool is the easy and safe way to convert OST to PST formats and also in 15+ other formats like - PST file, Office 365 files , Zimbra, Gmail, EML, EMLX, vCard, ICS, MSG, Live Exchange server, MBOX and etc.