If you don't want to lose your PST files database while merging two PST files that I want to recommend MailsDaddy PST Merge and JoinTool. It safely combines multiple PST files into a single PST file. With the tool, users can also merge password-protected PST files into a new PST file. The software enables users to combine ANSI, Archive, and Unicode PST files into PST files without any changes in the original database. Users can skip the duplicate items while merging PST files. It provides a compatible PST file that can be imported in all Outlook versions.
RE: How to Combine two PST file into single PST file
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How to Combine two PST file into single PST file