Consolidate your multiple PST files into a PST file by using MailsDaddy PST Merge and Join Tool. Using this safe solution users can easily combine password-secured PST files into a new PST file. It is also compatible to move ANSI and Unicode PST files with maintaining folder hierarchy, text formatting, and email properties. The application has the capability to merge the unlimited size of PST files without any changes in original content. It provides a unique combined PST file that can be imported in Outlook 2019, 2016, 2013, 2010, and others.
The software comes with a free trial version to check it before purchase. The free demo has the ability to combine the first 20 emails per mailbox without any changes.
Get more info: Merge PST file