Merge Outlook PST Files with SysTools PST Merge Tool

Open SysTools PST Merge. Go to Start menu » Programs » SysTools PST Merge » SysTools PST Merge. You will see the following screen:

Choose Outlook PST files to merge them into a single PST file. To select PST files, click the Add File or Add Folder button as shown below in the red marked area:

After clicking the Add File/Add Folder button, you will see the following screen:

Select PST file/files and click the Open button. You can either select a single PST file or multiple PST files (Shift or CTRL + Mouse Dragging) at a time. After selecting a number of PST files, software will list all the selected files as shown under:

If you want to remove any selected PST file/files from list of files, then select the file and click the Remove button as shown below:

You will see three options for merging the PST files. You can choose any one option from them. Also choose the advance options by checking/unchecking the boxes as shown below in the following screen:

Join - Selecting this option will join/merge PST files by creating new folder for merged PST file
Merge - Selecting this option will merge similar folders into a single PST file
Merge Contacts - Selecting this option will merge only contacts of selected PST files
Remove Duplicates - Checking this box will remove all duplicate items of selected PST files
Exclude Deleted Items - Checking this box will exclude all deleted items folder contents.

Select a location to save the merged PST file. Click the Browse button as shown below in the red marked area:

Choose a location where you want to save the merged PST file and click the OK button. After you select the location, you will see the following screen:

Click the Merge PST Files button to start the process of merging PST files to a single PST file as shown below in the red marked area:

After clicking the Merge PST Files button, the merging process will start as shown below:

After completion of the merging process, you will see the status message as shown below:

In the prompted message box, click the OK button. After clicking, you will see the details (name of the files, no of folders & saving location) of the merged PST file as follows:

Here, you can compare merged PST file items with original PST file items by clicking the Compare button in the above screen. After clicking, you will see the details as follows: