A very large Outlook PST file can slow down your system and even cause errors over time. When the file keeps growing, it becomes harder to manage backups and daily email tasks. If you need to split PST file into smaller parts, using a dedicated tool makes the process much easier. The MS Outlook Help PST Splitter allows you to divide a large PST based on size, so you can control how big each new file should be. It supports both ANSI and Unicode PST formats, making it compatible with different Outlook versions. The folder hierarchy stays exactly the same after splitting, so your emails remain properly organized.