You can try vMail OST to PSTConverter that can easily convert all OST to PST without any hassle. It can convert single or multiple OST files to PST at once without any data loss. It also converts all the items from OST to PST such as emails, attachments, etc. This tool can repair corrupted or inaccessible OST files and restore them to working conditions. It also recovers deleted or posted OST files. It saves the resultant OST file to EML, PST, and MBOX. Its interface is user-friendly and allows all users both technical and non-technical can easily use this tool without any technical understanding. It provides a free demo version also to ensure the user about its features and functions.
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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.