Go for the best solution to merge multiple PST files in one PST format with the help of GainTools Merge PST Software. It can merge multiple PST files without a single error with a basic technical understanding because it has a simple graphical interface to merge multiple PST files in one PST format. Users can work with any version of Microsoft Outlook, including 2021, 2019, 2016, 2013, 2010, 2007, and 2003, without restrictions. Users can install this application on Windows 11, 10, 8.1, 8, 7, XP, and Vista and get a free demo to merge a few PST files in a single PST format with no error.