The simplest way to merge multiple Outlook PST files is by using the SysInfo PST Merge Software. It lets you quickly combine different PST files into one single Outlook data file. You just need to select the PST files you want to merge, choose your preferred merging option—either Merge PST, Join PST, or Merge Contacts—and start the process. The tool can remove duplicate items, filter data by date, and even exclude attachments if you want to reduce file size. It works smoothly with all versions of MS Outlook, making the process safe, fast, and effortless.
Read more: https://www.sysinfotools.com/recovery/pst-merge.php