Launch SysTools Mac PST Merge software on your system and the follwing interface will appear.

Options to Browse PST File
Pick any two options: Add File or Folders to upload several PST files.

Choose the PST Files that you need to combine and hit Open button.

Find PST File from Host System
User can simple use Search PST option to search for a specific PST files.

Now, the tool will show Search PST Result and user need to check and after that click on the Add Selected option .

You can verify all add PST Files in the software UI. Here software allows users to remove unwanted PST file by using Remove or Remove All button.

The Mac PST Merge software provides two options for merging Outlook .pst files into single one such as Merge / Join. Choose the option as per your convenience.

Here the software will list all folders of browsed PST file and allow users either choose some selected folder or choose entire folder.
Merge Options: Software provides multiple options to merge PST file data. Select "Merge in New PST" to create a new PST file on your system. Along with this it provides an optional option to Merge in Single Folder.

Next, You can select "Merge in Existing PST" option to combine Outlook PST files with an existing PST file. With this user can choose an optional feature to Merge in Single Folder option.

Note: If you want to merge PST files into Existing PST , then Outlook should be installed and configured properly. Make sure that the PST files should not corrupt and not in use by any application when you merge them into one.
Click on "Browse" button to change the location path to save merged PST file.

A pop up will appear to select the path to save output. Here it allows users either create new folder or select any other folder. At last hit Open button.

You can verify the browsed folder here and then click on the Next button to start the process.

In the Filter section, Select Items Types: Mail, Calendar, Tasks, Contacts, Journal, Notes that you want to merge.

Now, you can "Specify Date Ranage" according to the needs. Click on Add button and select the Date.
Select the "Start Date" and "End Date" to merge PST files with a specific date. Then click on the Add button.

After adding date filter the tool allows to remove unwanted date filter by clicking on Remove button.

Advance Option Section to Customize Merge Process

Note: For the Split PST file, It is allowed to split the PST files into a Minimum of 100 MB and Maximum size of 200 GB inorder to avoid the chances of file corruption in case of Large PST files.
Select the Skip Duplicate Items checkbox and then select Specify Criteria. Now select the required items from Mail, Contacts, Calendar, Notes, Task, and Journals to remove duplicates.

Select the Email Fields: Subject, Mail Body, To, From, Cc, Bcc, Attachment, Sender Name, Internet Message ID, Sent Date.

Select the Calendar Fields: Subject, Start Date, End Date, Attachment, Categories, To, Cc, Bcc, From, Location.

Select the Contacts Fields: Full Name, Email Address, Mobile Number, Job Title, Categories, Company, Birthday.

Select Task Fields: Subject, Start Date, Body, Due Date, Categories, Companies, Status, Attachment.

Select Notes Fields: Body, Categories, Creation Date, Size

Select Journals Fields: Subject, Start, Attachment, Body, Categories, Entry Type, Company

After, click on Save button to save all settings.
Now, tap on Set Password in PST option to add passcode on the PST files.

A pop-up will appear, set the password according to your choice and hit on OK button

Here software process the browsed PST files and list all folder in folder tree view. User can either select some folder for joining or select all folders.

Under Options, Select the "Join in New PST" to join multiple PST files into a new PST file. User can check the Join in Single Folder checkbox if required.

Under Options, Select the "Join in Existing PST" to join PST files in existing PST file. User can check the Join in Single Folder checkbox if required.

Then, Click on the Browse option and select the path on your system to save joined PST files.

A new pop up window will appear to browse path, here you can create new folder as well. After this hit Open button.

Verify the browsed path and move to next step.

Now, click on the Next button to run the merging process.

In the Filter section, Select Items Types: Mail, Calendar, Tasks, Contacts, Journal, Notes that you want to join.

Now, you can "Specify Date Range" according to the needs. Click on Add button and select the Date.

Mac PST Merge Software also allows users to remove unwanted date range. For this select it and hit Remove button.

In the Advance Option, you can choose the following option as per requirement.

Note: For the Split PST file, It is allowed to split the PST files into a Minimum of 100 MB and Maximum size of 200 GB inorder to avoid the chances of file corruption in case of Large PST files.
Note: Skip Duplicate Items option is not available for Join process.
Now, click on Set Password in PST to lock the PST files.

Now, set the password according to your choice and click on Ok button.

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