Easily split large OST files by size, date, year, or folder using SysTools OST Splitter Software. Improve Outlook performance and manage data more efficiently. Managing oversized Outlook OST files can be a serious challenge for both individual and enterprise users. Large OST files not only slow down Outlook performance but also increase the risk of corruption, leading to potential data loss. To overcome these issues, SysTools OST Splitter Software offers a smart, reliable, and user-friendly solution to split large OST files into multiple smaller and manageable parts—without altering the original data structure or content.

Whether you’re dealing with an active Exchange account or working with orphaned or inaccessible OST files, SysTools OST Splitter ensures safe and precise file division using various smart filters like Size, Date, Year, and Folder. Designed with performance and ease-of-use in mind, this OST file splitter is perfect for IT administrators, corporate users, and home users alike.

SysTools OST Splitter is a professional Windows utility that allows users to split OST files created by Microsoft Outlook into smaller PST files. It helps avoid file-size-related issues such as corruption, lags, and email access delays. Users can divide OST files as per their preference, improving Outlook performance and ensuring better data management.

Key Features of SysTools OST File Splitter:

Break large OST files into smaller chunks by choosing a preferred file size (from 1 GB to 50 GB). Ideal for users who face file-size limitations or performance degradation in Outlook.

Split OST by Date Range

Use the Date filter to split OST files according to a custom date range. This is helpful for users who want to archive or isolate emails from specific time periods.

Split OST by Year

Automatically split Outlook OST data year-wise into separate PST files. This allows easier year-based searching, exporting, and data archiving.

Split OST File by Folder

This unique feature lets you split OST data folder-wise. For example, generate separate PST files for Inbox, Sent Items, Drafts, and other custom folders.

Works with Inaccessible & Orphaned OST Files

Even if your OST file is disconnected from Exchange or is not opening in Outlook, the tool can still process and split it without requiring Outlook installation.

Preserves Data Integrity

The software maintains original email metadata (To, From, Subject, Date), folder hierarchy, attachments, read/unread status, and inline images throughout the splitting process.

Compatible with All Outlook Versions

Supports OST files generated by Microsoft Outlook 2021, 2019, 2016, 2013, 2010, and earlier versions. Also compatible with Windows 11, 10, 8.1, and 7.

Simple and User-Friendly Interface

No technical expertise required. Anyone can split OST files in a few clicks with the help of its interactive graphical interface and step-by-step instructions.

Split OST by Subject

Software allows users to specify the subject and it will split the OST file based on the provided subject.

Split OST File by Sender

Software allows users to provide a specific sender email address and the tool will split the OST file on based of provided email address.

Use Cases of OST Split Tool

• Corporate Environments: Manage large mailboxes for multiple employees and reduce Outlook lag across systems.
  

• Data Archiving: Split OST by year or folder for easier archival and compliance management.
  

• Exchange Server Failures: Process orphaned OST files after server crashes or account deletions.
  

• Migration Projects: Prepare clean, smaller PST files (To split, use SysTools PST Splitter tool) for smooth import into new Outlook profiles or Office 365.

SysTools is a well-known name in data recovery and management solutions with over 15 years of experience. The OST Splitter Software is widely recommended by IT professionals, system admins, and Outlook experts. It is completely safe to use and free from any hidden installations or data-sharing processes.