Using SysInspire OST to PST Converter, convert an Outlook OST file to a PST file. This is an extremely strong tool. It converts Outlook OST files to PST and a variety of other file types, including Gmail, Office 365, Yahoo, MBOX, MSG, EML, HTML, EMLX, vCard, ICS, and Zimbra. You can use the email filtering option to convert specific Outlook OST files based on a date range. A preview of your Outlook OST file is also available. Get 25 mailbox items from each folder when you download the free demo version of this tool.