Convert OST to PST
eSoftTools OST to PST Converter software is the most famous OST file conversion tool that easily converts Outlook OST file into PST and many other formats such as EML, HTML, EMLX, MBOX, Zimbra, Yahoo, Gmail, Office 365, ICS, MBOX, and vCard. It also provides many types of cool features to convert Outlook OST files fastly. Check the free demo version of this tool and get 25 mailbox items from each folder.
read more- https://www.esofttools.com/ost-to-pst-converter.html

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Drakejosh commented
The easiest and most efficient way to convert OST files to PST format is by using a reliable third-party application. Manual methods are often time-consuming, complex, and carry a high risk of data loss — making them less ideal for most users.
Among the many OST to PST conversion tools available, the GoldyTools OST to PST
Converter stands out as a highly effective and user-friendly solution. It requires no technical expertise, allowing users of all levels to seamlessly convert OST files to PST format.The tool supports bulk conversion, regardless of OST file size, and is fully compatible with all major versions of Microsoft Outlook, including Outlook 2003, 2007, 2010, and 2013. Whether you're migrating a single file or an entire mailbox, GoldyTools offers a safe, fast, and reliable way to get the job done.
https://www.goldytools.com/blog/top-6-situations-convert-ost-to-pst-necessary/ -
[Deleted User] commented
Kernel for OST to PST Converter is a straightforward tool that can recover data from OST files and save it in PST format. It supports all versions of Outlook and offers a simple and intuitive interface. https://www.nucleustechnologies.com/ost-to-pst-converter.html