If you have multiple Outlook PST files, you may encounter issues such as file corruption, sluggish Outlook performance, and difficulties in file management. In this situation, you will need a reliable and easy PST merging tool. I would like to recommend a highly trusted and secure application, named MailsDaddy PST Merge and Join tool. This user-friendly software is compatible with all versions of MS Outlook, including 2019, 2016, 2013, and earlier iterations. It supports all ANSI, corrupted, damaged, archived, password-protected, and Unicode PST files and gives a unique option to delete duplicate emails or folders before combining. Furthermore, it functions seamlessly on various Windows operating systems, such as Windows 11, 10, 8.1, 8, 7, and their predecessors.