To manually convert an OST to a PST file, open Outlook and create a new PST file via "File > Open & Export > Import/Export," then use the "Import/Export" wizard to export data from the OST file and save it to the newly created PST file. However, this method is time-consuming, prone to errors, and may not work for corrupted OST files. For a more efficient and error-free solution, consider using a professional tool like Migrate emails OST to PST Converter.
It is good to the manual way to convert OST Files to PST as many users need to backup the Outlook mailbox. Thanks @Addyy_Wang for share this info. But many IT experts suggest some applications like Softaken OST to PST Converter for converting OST to PST in bulk for ease of work.
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