If you are getting the "OST file cannot be accessed" error in Outlook 2016, choose eSoftTools OST to PST Converter software. This software helps to recover OST file and fix problems associated with corrupted OST files. Also, no technical expertise is required to use this software, you can do your work in a completely safe manner. Also, this software is available for all your Windows versions (even Windows 11).
Read more- https://www.esofttools.com/blog/how-to-fix-ost-file-cannot-be-accessed-outlook-2016/