Suggest me best solution

 

If you wants to merge the various PST item then I would suggest for used the KDETools PST Merger. It supports all the Windows and Outlook Version. This tool has not required MS-Outlook. It merge only selective items.

Read More: Outlook PST Merger - Combine & Join, Merge Multiple PST Files in One

 

You can merge multiple PST files into single PST and for that try, Mac Merge PST software. This tool helps you to merge PST files with their all data items like emails, contacts, calendars, etc. You can choose any one of the options according to your needs.