SameTools Merge PST Files is the best solution it not losing your original PST data. This app allows users to merge large PST files into a single in any size without limitation. It can work without requiring MS Outlook installation. It supports both ANSI and Unicode PST formats and preserves all email, folder structure, and metadata. The tool also offers options to merge entire PST files or specific folders like the Inbox or Sent Items. It's compatible with all Windows OS versions and supports all Outlook PST files. The software also provides a free trial version for all users before purchase.
Visit here: https://www.sametools.com/merge/pst/
