With Outlook ost converter tool, you can simply export all attachments of ost files into Outlook PST data. There are no size restrictions for Outlook ost to pst conversion. This Outlook ost to pst converter software is 100% safe and secure which maintains the data hierarchy while converting ost to pst and also keep safe your original structure of data after conversion. The Outlook ost converter software allows multiple types conversion like outlook ost to PST, Office 365 account, olm, EML, EMLX, MSG, HTML, MHTML, MBOX, VCF, CSV, ICS, Live, Exchange Server, Zimbra, Gmail, Yahoo, and etc.