If you need to merge large Outlook files, I recommend the Merge PST Tool; it is a very good and safe application. It can easily join Outlook PST files to other Outlook PST files without any data loss and ignore empty files. It is very simple to use, saves time because it works quickly, and supports all versions of Windows such as 11, 10, 8.1, 8, 7, XP, and Vista. And there are some easy ways to use it.
Firstly, download the Merge PST Application.
Select the PST file or folder mode option, and click Browse.
Preview your selected PST database.
Select the output location and click on the browse button.
Finally, click on the “Merge Now” button to join your Outlook PST file.
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With the manual techniques, you have discovered that it is feasible to manually add data from numerous PST files to an Outlook 2019 PST file. Nevertheless, dealing with huge PST files and repeatedly performing the same import procedure would be rather difficult. But we do have a foolproof answer for you; it just takes a few minutes for our sophisticated program, Merge PST Tool, to finish the job. It can combine PST files of any size and from any version of Outlook. There are filter settings and the possibility to choose certain folders for the merging procedure. The program gives flawless results without discarding any data that customers have chosen, regardless of PST file size, quantity, or Outlook version.