advance pst merger
 

Which tool is Preciously Capable to merge both ANSI and Unicode version PST files ?

Merge PST software allows multiple Outlook files merging within a few minutes and provides option to avoid duplicate items as it supports filter option to remove duplicate items during merging process.You can also try out PST Merge Software. I have used the free version and let me tell you the software is a ground-breaking tool integrated with the intelligent scanning algorithms that allow you to merge an unlimited number of PST files into a single PST file in no moment of time. This utility merges various MS outlook contacts, outlook emails, and outlook calendars into one PST file with great ease. To know more about the usability and its feature of this incredible tool.
http://www.softakensoftware.com/merge-outlook-pst.html