If you’re searching for a secure way to merge PST files, MailsDaddy
PST Merge Tool is a perfect fit. It allows you to
combine multiple Outlook PST files into a single PST file while keeping all items like emails, calendars, and contacts intact. The tool also supports selective folder merging and skips duplicates automatically. It works independently without needing Outlook and runs on all major Windows platforms from XP to Windows 11.