Free ToolsGround OST to PST Converter to export OST to PST, EML, EMLX, MSG, and MBOX formats. Freely export any size Outlook OST file with this program. Users can freely export all items of OST file or some filtered items as per their requirements. Multiple OST files are converted using the software without any hassle and data loss issues. Compatible with all Outlook and Windows versions. Attachments and meta-properties are safely exported.