Split PST File Software is a Windows tool that takes one oversized Outlook PST or OST data file and writes it out as several smaller PST parts. When you need to split PST file archives that have grown slow or crept toward the old 2 GB ANSI limit, it reads the data file directly, with no Outlook running and nothing uploaded. Your source is only read, never changed.
Outlook has no built-in way to divide a data file, and its Compact Now command only reclaims empty space. Moving folders by hand into new files works for a small mailbox but turns slow and error-prone on a big one. This program does the job in one run: it can split PST file content in one of four ways, and you decide which folders take part. The result is a set of ordinary PST files that Outlook opens like any other, so you can attach the parts you still use and store the rest.
🛠️ How to use
1. Add one PST or OST file. Its folder tree loads on the left with checkboxes.
2. Untick folders you can live without, for example Deleted Items and Junk.
3. Pick a mode: By Size, By Date period, By Folder or By Sender, then set its value.
4. Choose a destination folder and press Start. Each part is saved as its own PST beside a CSV summary.
💼 Why IT and office teams pick it
By Size cuts between messages with a cap in MB or GB (1 GB by default), so no email is torn across two files.
By Date period groups mail by Year, Month or Week, with names like 2023.pst and 2024.pst.
By Folder sends every top-level folder to a separate PST and keeps the hierarchy inside it.
By Sender builds one PST per correspondent, and rare senders share an others.pst.
A CSV report lists every part with its file name, message count and size.
All processing stays on the local PC, which matters for private mail.
👥 Who uses it
Helpdesk staff who inherit huge mailbox archives that time out during backup. Legal and compliance teams who need one custodian or one year in a file of its own. People with a decade of mail in a single data file who want to split PST file archives per year before something breaks.
❓ FAQ
Can I split PST file into smaller parts without Outlook?
Yes. The program reads the PST or OST itself, so Outlook does not need to be installed or open.
How do I split PST mail into yearly files?
Select By Date period and set Year. Every calendar year is written as its own PST, and undated items get a separate part.
Will the parts be exactly the size I set?
Close to it. Splitting happens between messages, so a part can land a little under the cap, and an extra large message becomes a part on its own.
Does it modify my original file?
No. The source is opened read-only and new PST files go to the folder you choose.
🖥️ The free trial processes a sample of your mail with no sign-up. Runs on Windows 11 and 10 with 4 GB of RAM and 1 GB of free disk space.
Shefware PST Split is a software solution intended to split oversized Outlook PST files into several small PST files while keeping all the contents safe. It allows to resolve some of the most frequent problems of oversized Outlook PST files, including poor performance of Microsoft Outlook, increased risk of corruption, and Microsoft Outlook's limitations in terms of PST file size. Shefware PST Split makes it possible to split the mailbox information into several PST files, keeping the original structure and metadata intact.
One can use different criteria for PST splitting, such as the size of the file, the period, or the specific folders. It helps to organize split output in a convenient way for the user. One may want to split emails by years or separate specific folders into their own PST files. It works with ANSI and Unicode PST files and does not require Microsoft Outlook to be installed.
Shefware PST Split targets individual users of Microsoft Outlook with large mailboxes and IT professionals dealing with PST files within organizations.
SysTools PDF Split and Merge to divide & combine Adobe portable document format files. The can divide large pdf file into small pdf files and similarly it can combine all the small pdf files into a large PDF document.
An easy solution to break the large PST files into small parts. This tool provides some unique options that are split according to "Date", "Email Address", "Folder", and "Size". This software also supports the ANSI as well as Unicode PST files and it can segment the oversized PST into small or multiple files within a few clicks.
Mailvita Split PST Tool for Mac is a smart and fast solution to break large-sized Outlook PST files into smaller parts for better management. This tool offers three effective ways to split PST files — by size, folder, and year. Whether you're dealing with active PST files or archived ones, the software ensures safe and lossless splitting without affecting the original data structure or formatting. It supports both ANSI and UNICODE PST files and does not require MS Outlook installation to perform the task. The tool preserves all PST metadata properties and ensures that your emails, contacts, calendars, and other items remain intact throughout the splitting process. This application works on both types of operating systems, like Mac and Windows OS. Users can easily work on this tool without any help. Any user can simply download the software and try out the free demo version.
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Split PST File Tool is an excellent utility which divides large PST file into manageable and smaller Outlook PST files as per the particular criterion like size, date, folder, and email id, and defends them from any corruption issues because of file size limits. It is fully capable of splitting all MS outlook item such as folders, contacts, calendars, journals, email folders. The application makes you sure that no actual data deleted during the process. This extraordinary tool helps the users to work with many versions of MS Outlook PST as well as it is compatible with different versions of Windows.
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Datavare There is no requirement to specially download any software to split large PST file into smaller files. Outlook PST Split tool works independently. No file is damaged during the division of PST files. All Outlook versions PST file is well-supported by the program.
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The ViceVersa PST Split and Merge Software is a professional and easy way to split large Outlook PST files into several PST files and merge an infinite number of PST files into one PST file. An expert way to swiftly split or combine PST files without erasing data. Even if you are not technical, this software is easy to use. Windows operating system versions 11, 10, 8, 8.1, 7, XP, Vista, and others are all supported. It can split a PST file into multiple PST files and combine an infinite number of PST files into a single PST file without erasing any data, regardless of the size of the PST file. One of the best methods for dividing huge PST files into many PST files is to use the software. Users can install it and test out the free trial version because it is lightweight. Email clients are not necessary for splitting and merging large PST files. This application supports all MS Outlook versions, such as 2021, 2019, 2016, 2013, 2010, 2007, 2003, and 2000. All Outlook file formats, including ANSI and UNICODE, are supported.
SysTools PST Splitter is a dedicated utility designed to split large Microsoft Outlook PST files into smaller, manageable parts. It helps users reduce PST file size to avoid Outlook performance issues, file corruption, and size limitations. The tool supports both ANSI and Unicode PST files and works with all major versions of Microsoft Outlook and Windows.
The software offers multiple splitting options, allowing users to divide PST files based on size, date, year, folder, or email ID. This ensures better mailbox organization while preserving the original folder hierarchy and data integrity. All email items such as emails, contacts, calendars, tasks, journals, and attachments, remain intact after the splitting process.
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