This utility merges multiple Outlook PST data files, creating new PST files. It works with PST files located in Outlook, local disk or network share. Completely free.

One of the key advantages of this tool is that it does not change anything in your original files but simply creates new PST files. Additionally, this utility works with PST files of any size supported by Outlook, with no limits on the number of folders and messages.
If needed, you can also split the combined PST files into pieces by size or use the filter by folder type feature to merge only Outlook contact folders or only calendars from different PST files. This can help you create a more organized merged PST file.
Furthermore, this tool allows you to skip or replace duplicates, making it ideal for backing up multiple PST files. The utility supports macros in names of stored files and folders inside PST files, and can skip deleted items to avoid copying redundant data when merging PST files.
After the merge is complete, you will receive a detailed report that shows how many items have been copied, skipped, or replaced for each PST file. To get started, simply select a folder with PST files on your disk or network share, specify the name of the combined file to be created, and run the utility.
Overall, this tool is easy to use, highly customizable, and supports command line operations, making it perfect for anyone who needs to merge multiple Outlook PST files on a regular basis.
Version 4.20: New features and enhancements.