How to Merge Outlook Mailboxes - Version 3.0 If you are failed to accomplish the task to merge multiple Outlook PST files into single PST, it is recommended to try our PST Merge software to manage multiple PST files together into one file. This software is a perfect answer for your query for how to merge Outlook mailboxes items together. In online market, there are numerous third party tools available but the convenience and efficiency our software provides is hard to get anywhere. Providing many high-tech features, this desktop utility becomes top choice of users to combine UNLIMITED PST files into single PST. If you need to know how to merge Outlook mailboxes, then feel free and happy this tool does this task easily. Do this task only1. Install complete setup of software, you do not need to scan by any antivirus this is safe and secure2. To merge PST files you can select ANSI as well as Unicode PST files3. To start the process Click on Add button only. Synchronization process will start automatically4. Find Single PST in place of multiple PST.