If you are searching for an affordable and appropriate solution to merge multiple Outlook PST files at once into one PST file. I recommend you utilize the MailsDaddy PST Merge & Join Tool. This reliable and efficient software swiftly combined two or more Outlook PST files in a single PST without losing any important data and maintained the original folder structure during the merging process.
Read More: Best PST Merge Tool
Blog: https://www.mailsdaddy.com/blogs/manual-trick-combine-multiple-pst-files-single-pst-file/