Probably one of tips is effective

A corrupted OST (Offline Storage Table) file is essential when using Microsoft Outlook in Cached Exchange Mode because it contains a local copy of your mailbox data. If the OST file gets corrupted, it could be impossible to access your emails and other data. However, I would advise you to try the ZOOK OST to PST Converter program as well. an application that can convert Exchange OST files to Outlook PST without requiring Outlook installation. With this utility, users can import.ost files directly into Outlook 2021, 2019, 2016, 2013, 2010, 2007, etc.to export emails, attachments, contacts, calendars, tasks, and other OST mailbox data items into PST format.

Check for more details at: https://www.zooksoftware.com/ost-to-pst/

I know I am too late too answer this thread. But various users are facing Errors that have been detected in the OST file issue so you can try Quickdata OST to PST Converter to resolve corruption issues of the OST file. By using this software the user can easily convert the OST file data to PST format. Also, the user can completely access the data from highly corrupted or orphaned OST file. For complete info, the user can try the demo version of this software from here. https://quickdata.org/ost-to-pst.html

You can do it in various ways as there are various manual ways to Convert OST to PST.
But if you are not a techie guy then I suggest you not to use manual ways as the chances of data loss in manual methods are higher and it is unsafe.

The fact, I am not suggesting manual ways to convert OST to PST is because it is time-consuming and ineffective in corrupted Outlook OST file.

The OST to PST Converter is a great way to convert OST to PST as it allows the user to quickly convert OST to PST without any hassle.

Here are three best methods to convert OST to PST: https://www.datarecovo.com/blog/easy-methods-convert-ost-to-pst-file/

Get more info: https://www.datarecovo.com/

OST to PST Converter is world's #1 click-n-convert utility which safely and flawlessly converts OST email objects and exports the same into fresh PST file format at any location defined by the user.It saves all the email messages in PST, MSG, HTML, RTF and PDF file formats after conversion.Just download the free trial version of OST to PST Converter software, free version is integrated with full featured rather than to save data.

There is a strange and not new method to get corrupted .ost files back. It is called conversion from one extension to another. For this purpose on market there is a Recovery Toolbox for Outlook it was created especially for any versions of MS Outlook and for huge .ost and even .pst files too.