You can use eSoftTools OST Converter Software to import OST files into the eM client. This tool has an email filtration option, it emails on specific dates by date range. All Outlook versions are supported for the conversion. After conversion, the OST file is split into smaller PST files. Get a free demo from the website of eSoftTools Software, free demo converts 25 items from every folder of the OST mailbox.
About Know More: Import Outlook OST files into the eM client