Stellar Merge Mailbox for Outlook can merge multiple PST files, including Emails, Notes, Calendars, Contacts, Journal, etc. into a single PST. It preserves the original folder structure and mailbox data while merging the contents from multiple ‘matching' folders in the source PSTs. The tool can also merge specific folders without merging the complete PST files. The software allows the user to join PST files of different Outlook versions. It combines the PST files by generating root folders for accommodating the child folders from source PST files. The software arranges the child folders in a well-structured hierarchy in the final PST file and preserves the original mailbox contents after combining the PSTs. It can merge or join large-sized PST files efficiently and works with high precision and reliability. The tool can also merge password-protected PST files, provided the password is available. The user can install and run the software on systems running Windows 10, Windows 8.1/8, or Windows 7 OS. The tool allows the user to eliminate duplicate items while merging the PST files. It can remove the duplicate items based on parameters like Subject, Sender Email, Text, Sender Name, Recipient Name, Internet Header, Attachments, and Date and Time. The software provides Default & Advanced Duplicate criteria to eliminate the duplicate items. It also allows the user to exclude the Deleted and Junk Items folders while merging PST files. This feature facilitates removing unwanted items, thereby ‘cleaning up' the final, merged PST file. The tool can save the merged or joined PST files in a new or the existing PST, Outlook profile, Office 365, or Exchange Server. The Outlook PST merge software generates a detailed log report having details such as Process, destination location, start and end time, source file, folder names, etc. It can merge or join the PST files of Outlook 2019, 2016, 2013, 2010, 2007, and 2003.