EdbMails OST to PST converter is a free tool that allows you to recover all of the contents of an OST file and convert it to PST. OST files can also be exported into a number of formats, including MHT, HTML, EML, and PST, which includes all emails, contacts, calendars, deleted items, and so on. With a free demo version for user testing, this tool supports all versions of Exchange and Microsoft Outlook up to 2019 and Windows versions up to 10 (32, & 64-bit). It supports offline recovery and conversion without having to connect to the internet or depending on Exchange server services.