Divide OST Files into smaller parts with accuracy by folder, date, year size, email ID, category, etc. using the OST Splitter Tool on Mac OS.
MacUncle’s OST Splitter for macOS takes a few steps to divide OST mailboxes
Set up Tool on Mac OS
Download and install the OST Splitter Tool to your Mac OS Computer and install effortlessly. Select OST files using Add File(s) or Add Folder(s) and press the next button to move further.
Select Splitting Option
The divider tool gives different options to split the Outlook OST file according to the attributes such as by, from, Size, Date to Date, etc. and a Filter option to filter out the Mailboxes. Then hit the OK button.
Read Software Features to Split OST File on Mac OS X Professionally
Split Large OST files in Outlook
The OST splitter is developed to split large OST files into smaller components. This division also helps to eliminate any problems with corruption in the Outlook OST register. Moreover, in the entire process, it keeps critical data secure. To remain intact the Properties of Metadata, Bcc, Cc, etc.
Split OST by folder Option
Users can easily break various OST data into Outlook 2010 and 2013 versions with this option. For each specific folder, the program generates an individual file. It separates the OST files according to the size that a user has set. When using this utility for splitting, there is no need to think about the protection of user data.
Large OST Splitting Facility By Size
Users may reduce the size of the OST file, which is very wide, with this option. They just need to set the unique file size that they want their OST to be split into. Once it is done, as per the mentioned file size range, the program will begin the process of division. Although, this tool does not split the already corrupted OST data.
OST File Reduction by Year
To break down Outlook OST files by year, OST Splitter provides an alternative. It can be divided by users depending on the year. You have to choose a "split OST by year" option for this. After that, the tool allows a user to detach a large OST file on an annual basis. Suppose, if a user has selected 2016 to 2017, then two OST files will be generated individually.
Report from Live Split
OST Split Software produces a live status report until the process is complete, which consists of a folder path, folder name, processed objects, total, etc. For future references, save the report in a TXT file format.
Browse Folder for Destination
Users can search the destination location in OST Splitter with this function to save the output to a local drive. The output is stored in a different format, keeping the meta properties and the configuration of the internal folder intact.
Interface Easy-to-use
An intuitive interface is given to get the OST split process completed with this program. With self-descriptive measures, the process is so simplified that it can be understood even by a naive person.
No Limitation on File Size
The OST Splitter has the ability to load Outlook OST at any size. When users have a big OST and want to reduce the size of a file to make the file manageable, this utility is helpful. Users are able to divide the Outlook OST file into many folders.
Understand Hardware and Software Requirement to Launch OST Splitter
Split OST Files
| Version: | v1.0.2 |
| Size: | 8.29 MB |
| Release Date: | May, 2026 |
| Software Download: | Download Now Download Now |
| Trial Limitations: | OST Splitter Tool for Mac to divide large OST files into smaller mailboxes as per the requirement. The Demo version permits splitting the 25 OST files into a separate file. Purchase the license key to unlimited OST files at once. |
| Hard Disk Space: | 400 MB of free hard disk space required |
| RAM: | 512 MB of RAM (1 GB is Recommended) |
| Processor: | Apple Silicon M-series (M1 or later) |
| Platforms: | macOS 26 Tahoe, macOS 15 Sequoia, 14 Sonoma, 13 Ventura, 12 Monterey, 11 Big Sur, 10.15 Catalina, 10.14 Mojave, 10.13 High Sierra, 10.12 Sierra, 10.11 El Capitan, and 10.10 Yosemite. |
| Product Guide: | Software Guide Installation Uninstallation EULA |
Analyze the Software Interface with the Screenshots
See the differences in features between these two to determine which will best serve your needs for contact conversion.
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Features |
Trial Version |
Full Version |
|---|---|---|
| Number of OST Files Processed |
25 OST Files |
Unlimited |
| Load and Analyze OST Files |
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| Display Folder Structure |
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| Split OST by Size, Date Range, Folder, Year, etc. |
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| Create Multiple Smaller OST Files |
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| Maintain Original Folder Hierarchy |
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| Support Large OST Files |
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| Select Specific Folders for Splitting |
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| Choose Custom Destination Path |
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| Software Customization |
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| Suitable For |
Evaluation and Testing |
Personal and Professional Use |
| Provides 24×7 Technical Support |
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| Price |
Free |
$29 |
Watch the Step-by-Step Demo
Helping Users Simplify Splitting OST Files
Check out the ratings, reviews, and performance graph.
Performance
97%
Customer Satisfaction
93%
Output Accuracy
100%
Everything You Need to Know About OST Splitter
To divide OST files into smaller separate files, follow the steps given—
Yes, the archive folder can be split by size, date, folder, and year using the tool.
Yes, you can divide the corrupted OST file by this method. A safe file process tool to break the OST file.
Yes, when Outlook is slow or freezes frequently, it might be due to a large-sized OST file. Splitting the OST file into smaller, manageable segments can improve the performance. To understand why the OST file becomes so large in the first place, you can read the detailed guide and fix it with more flexible methods: Why is the OST File so large?
Yes, the tool loads and separates all OST sizes. Further, all versions of Outlook are supported.
What Customers Are Saying
Frank
United States
Try out the web version, which has certain limits but is incredibly fast! & the outcomes are positive. Now I intend to purchase the updated version.
Sara
England
If you have a number of OST files to split then the application is right. The software includes an Add button that upload numerous files at once. This is applicable to phones, tablets, and PCs. The best app and programme I've ever used. It's fantastic!!
