Merge PST Software is a highly efficient program which merges multiple PST files into a single file. This innovative utility offers a cost-effective and fastest option to merge Outlook Contacts, Emails, Calendar, Journal, and other mail items into a single file without any loss in data.
Salient features:
High-speed merging process
Remove duplicate items
Merge only selected files and folders
Retain original file structure
Either exclude or include delete items
Support Unicode & big data merge
High-Quality compatibility
Demo version to try
For more info: http://www.completeconverter.com/merge-pst/