OST file size reduction tools are in high demand due to Outlook mailbox access delays and file corruption risks caused by oversized offline data files. With full data consistency and folder hierarchy preservation, SysInfo OST Splitter provides a dependable way to split big OST files into several smaller PST files. The program offers flexible control over mailbox organization with sophisticated splitting options based on folder, sender email address, file size, and date range. The Date Filter option, which divides emails from particular time periods into separate PST files for simpler data management and archiving, is one of its main features. The Create Single or Separate PST option, which permits either one combined PST or several independent PST files depending on specific requirements, is another helpful feature. Additionally, the tool allows you to add entire OST folders for batch processing, which makes it possible to handle more mailbox files at once more quickly. All email properties, attachments, contacts, calendars, and tasks do not change during the splitting process. The program ensures smooth performance even when handling very large mailbox data files, and it works effectively with OST files created in all major Outlook editions and supports all Windows operating systems.