If you want to merge Outlook data files, then try the Shoviv PST Merge Tool is the best way to make this task hassle-free. It does not set any kind of limitations on adding large and several PST files at a time. The software does not affect the folder structure and data integrity. Each user can perform this task without any technical knowledge. This software offers three options: Merge PST files, merge contacts folder, and Join PST files. The software is eligible to save the merged PST file into an existing or new one. It also lets users merge the ANSI and Unicode PST file types.
A free trial version of the tool is also available, you can install it from the Shoviv Official website.