Download OST to PST Software to recover outlook OST to PST, EML, MSG or HTML formats. With the help of OST to PST Conversion Software you can Convert Outlook OST to PST with full attachments- Inbox, Outbox, Sent Items, Deleted Items, Draft, Journals, Tasks, Calendars, Notes, and Contacts. This software allows you to Split large PST File into Small PST file from 1 GB to 5 GB. It works on OST version up to 2013