If you need a solution to merge small PST files, then the
Sysinfo PST Merge tool is the perfect solution. This tool easily and effectively merges multiple PST files simultaneously. Users can also merge Outlook contacts, emails, calendars, journals, and other mail items into a single file. It offers three advanced options to merge multiple PST files into one PST. The tool can remove duplicate items from the chosen PST files. User cam easily combine multiple Outlook data files with emails, contacts, calendars, tasks, etc. Available Option to apply password in the resultant Outlook PST file.
Access the tool:
https://www.sysinfotools.com/recovery/pst-merge.php