Advik PST Merge Tool is a secure and reliable solution to merge multiple Outlook PST files. The software is designed in such a way any novice user can easily use it without any technical training and guidance. It can combine multiple PST files and remove duplicates. It maintains folder hierarchy during the process. The best thing about this utility is that you do not need to install any other application to complete the merging process. You can download its free version to check its work efficiency and accuracy.