MacUncle OST Splitter

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.

  • Reduce the large OST file on Mac into smaller parts via Size, Year, Date, Folder, Email ID, etc.
  • When dividing a wide & oversize OST file size, MS Outlook is not necessary.
  • Split the OST file into one or more files easily & save in different format
  • Divide the entire OST file, including emails, addresses, calendars, etc.
  • Add single/multiple OST files or add an OST folder or browse for files
  • Support all OST file sizes as there is no restriction on the file sizes
  • Tool supports OST files of Outlook version 2019, 2016, 2013, 2010, 2007, 2003, 2000, etc.
  • Option to restore deleted or corrupted data files from Outlook OST before splitting

  • Compatible with Mac OS 10.8 Mountain Lion and all latest versions.
  • Safe & Secure Virus Total Safety Score: 100%

2 Simple Step – Mac OST Splitter

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.

Feature of OST Splitter for Mac

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 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 tool 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.

System Requirement

Get an Overview of OST Splitter Tool Features – DEMO and Licensed Version

Software Name: Mac OST Splitter
Processor: Minimum 2.4 GHz Processor
RAM: Minimum 1 GB
Minimum Hard Drive Space: 100 MB of free space
Operating System: X OS 10.8 Mountain Lion and all the latest Editions.

Software Specifications

  • Support: 10.15 Catalina, 10.14 Mojave, 10.13 High Sierra, 10.12 Sierra, OS X 10.11 El Capitan, 10.10 Yosemite, 10.9 Mavericks, and 10.8 Mountain Lion
  • Processor: 1 GHz Processor (2.4 GHz is recommended).
  • RAM: 512 MB of RAM (1 GB is Recommended).
  • Hard Disk Space: 10 MB of Free Hard Disk Space Required.


Size: 9.9 MB, Version: 1.0

Product Guides

Software Guide Installation Uninstallation EULA


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.

Electronic Delivery

The delivery of product is automated. You will receive an email containing both the link to download the product and the activation key within few minutes after payment confirmation.

Request For Software Customization

If you need to customize Mac OS OST Splitter or need additional features, Quote Request

Video Tutorial to Split OST File into Smaller Parts
Divide OST files into smaller files using the OST Splitter Tool

What Customers Are Saying

Verified Purchase Reviews - MacUncle OST Splitter
Frequently Asked Questions

To divide OST files into smaller separate files, follow the steps given—

  • Step 1: Download the OST Splitter on a Mac OS.
  • Step 2: Add the OST file to the software panel.
  • Step 3: Choose the OST file splitting option by file, size, and year.
  • Step 4: Browse the destination location to save small OST files, and click OK.

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, the tool loads and separates all OST sizes. Further, all versions of Outlook are supported.