As Per My Experience manual method and third party tool method, they both have their significance while merging PST is an important task as old PST files created with older Outlook versions now need a way to import all their data into larger single PST files that can be used with newer Outlook versions. Thus, in essence, we need to merge multiple PST files.
The manual method is cost-effective and has easy steps but PST is easily prone to corruption and losing all data is not what you want. Although the steps are easy still for doing that you should have the knowledge of Outlook wizard or must have technical knowledge.
So the third party tool method can be considered widely in this process as lifesaving because it's not tricky and user friendly, I would recommend you to go for my personal favorite PST merge tool which is
Stellar Merge Mailbox for Outlook. I have used this tool many times and I think it makes your PST easy to handle but doing it with a tool is safe and hassle-free for satisfactory results.
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