The most efficient way to merge Outlook PST files
Multiple PST files can be easily merged into one using the Regain Outlook PST Merger application. Be it an ANSI PLC file or UNICODE, this software ensures that emails, contacts, calendars, and other Outlook items come merging, completely working - without any data loss. It supports PST files with passwords, deletes duplicates, and maintains the original structure of the folders. The software has a very easy and user-friendly interface and is independent of Microsoft Outlook. Download Regain PST Merger now and get all yours merged into a neat single file with no hassle at all.

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sanjay kumar commented
To merge two PST files, you can use the SysInfo PST Merge Tool, a highly efficient and reliable tool that merges multiple PST files into one combined PST file. You can preview the added PST files and select folders to merge in the output PST. It also has the option to exclude attachments before the merging process begins and add password protection to the resultant PST.