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Live Free Demo: Download Free Outlook PST File Converter Software to convert 25 items/folder.

MailsWare Outlook PST Converter

A desktop program designed for rapid completion of multiple conversions. You can convert files from ANSI, Unicode and corrupt PST formats to PDF, EML, Gmail and others. It processes the data on your computer for fast conversions and protects its privacy, as nothing ever leaves your PC.

  • Bulk convert Outlook PST files with emails, contacts, calendar, attachments, tasks, notes, and journals.
  • Outlook independent tool that preserves meta headers, folder hierarchy, and inline images during conversion.
  • Converts PST files from older Outlook 2002 to the classic Outlook 2021 versions without the 2GB PST size limitation.
  • This enterprise-trusted tool supports converting PST with HTML, RTF formatting, and non-English characters.
  • Download the PST file converter tool on all Mac versions and Windows 11, 10, 8, 7, etc.

Awards and Recognition

Awarded and MVP Verified Outlook PST File Converter

Impactful Insight Award

Software Suggest

No Spyware Award

Software Informer

100% Clean Award

Softpedia

Why Choose

MailsWare PST File Converter: Performance, Mobility, & Privacy

Zero Knowledge Security

Zero Knowledge Security

The PST converter software performs ALL processing locally, using resources from your computer (i.e., memory and CPU) to transform millions of PST files into other formats. This means that your personal or business critical info is NEVER connected to anyone outside your secured network, therefore ensuring the utmost privacy and safety during the entire conversion process.

secure PST migration

Secure Cloud Migration

For securely migrating PST files from a local desktop to the cloud (i.e., Gmail, G Suite, and Office 365), the tool uses contemporary authentication standards/protocols to facilitate the data transfer. Specifically, MailsWare uses the OAuth 2.0 standard for authenticating to Gmail and G Suite, and Microsoft Graph API for authenticating against Office 365.

unbeatable performance

High Performance PST Conversion

While free PST file converters can only transfer one PST at a time, this professional software can utilize high-speed operations to convert multiple PSTs at once, therefore being able to handle very large amounts of Outlook data in a timely manner while producing results quickly and without error.

Screenshots

How to Convert Outlook Data Files in a 5 Step Process

Run Outlook PST Converter Toolkit
add PST files
Select PST folders
saving option
PST file conversion process

Output Options

Saving Choices Offered by Outlook PST Converter Tool

The all-in-one Outlook PST file converter software is designed to cater for all PST conversion needs, including migration. Therefore, this bundled application is developed with more than 30 saving choices to handle every PST data type and user need. The saving options offered by the tool are as follows:

  • Email Formats: Convert PST to EML, MBOX, MSG, EMLX, OLM, NSF, RGE, Zimbra TGZ. Maildir.
  • Document Formats: Batch Convert PST to HTML, DOC, RTF, TXT, PNG, JPG, BMP, TIFF, CSV, PDF, MHT, XPS.
  • Mailbox Migration: Import PST to Gmail, G Suite, Office 365, Yahoo, Thunderbird, Amazon WorkMail, Outlook.com, IBM Verse, My Office Mail, On-premises/Hosted Exchange Server, IMAP.
  • Specific Data Formats: Convert PST to ICS (calendar), vCard (contacts).
saving Options
Selective Conversion

Selective Conversion

Advanced Filter Settings for Selective PST File Conversion

Unlike a basic PST converter that blindly exports complete PST data to another format. MailWare toolkit for Outlook PST conversion comes with selective filter settings. These filter options offer more granular control over PST data for conversion and help in batch and quick PST file conversion. The filter settings added in the tool are as follows:

  • Date Range Filtering: Set specific start and end dates to convert PST data for specific projects.
  • Auto File Naming Options: The more granular metadata-based filters allow users to export selective PST data based on participants and keywords in the subject line.
  • To, From, CC & Subject Filters: The more granular metadata-based filters allow users to export selective PST data based on participants and keywords in the subject line.
  • PST Folder Filtering: This selective export feature is beneficial for users who need to convert specific PST directories, such as Inbox, Sent, Draft, etc., while maintaining the folder hierarchy.

Explanatory Features

Core Functionalities Packed in Offline Outlook PST Converter Software

dual options to add PST data

Dual Modes to Add PST Files

The MailsWare toolkit for bulk PST conversion has two ways to import multiple PST files, in contrast to the standard/free PST converter program which only has one option to import a single PST file. You can use the automatic PST import feature if you already have a PST file in your Outlook environment. If you have PST archives saved to your local drive, you can either add your files to the system using the Add Files or Add Folders feature.

PST conversion accuracy

Visual Content & Attachment Accuracy

The primary problem encountered with converting a PST file is keeping the visual DNA of the original mail intact. This tool has been engineered to eliminate this problem via its internal rendering engine. For instance, the internal logic that converts RTF documents to HTML also preserves embedded media attached to RTFs in the process. This sophisticatedly developed tool is capable of rendering all 30+ attachment formats as well.

supports ANSI/Unicode PST

Unicode/ANSI PST Intelligence

The internal intelligence built into this software allows it to discern between ANSI and Unicode PSTs. The software performs a deep analysis of the data structure using a B-Tree to locate all items in the PST file. These capabilities allow the software to work around the 2 GB limit placed on PST files while also being able to convert large volumes (even over 200 GB) of Unicode PSTs accurately and with no data loss/misrepresentation.

metadata and header preservation

Forensic Metadata & SMTP Header Preservation

Digital discovery and litigation support are achieved through a bit-level analysis of MAPI properties to ensure that all PST email metadata is written. In addition, all SMTP headers, X headers and RFC 822 compliant attributes will be maintained for proof of compliance. Because of the way the MAPI properties mapping functionality works, the Outlook PST converter provides the best workflow for digital investigators.

maintains folder hierarchy

Original Folder Hierarchy Retention

MailsWare's PST conversion tool uses a modern recursive scan method to incredibly detail your complete directory hierarchy associated with your PST file. This depth of scanning guarantees that migration results in every possible hierarchical sub-folder maintaining its original structure during migration, regardless of how complex its directory structure may be. Furthermore, every element of email metadata and original email properties are retained as a result of using this methodology, providing you with a true lossless transition into 30 different formats.

standalone PST migration tool

Standalone Independent Software

MailsWare PST conversion does not require an Outlook installation to work, thus providing benefits over other PST converters that require Outlook to be installed on the computer where conversion is taking place. This is accomplished by using a tool that works with the Hex data in the PST to extract the necessary information from the PST and convert it to 30+ output formats. The fact that it is a MAPI-independent tool means that it can bypass MAPI errors and provide a secure offline environment for PST conversion.

bacth processing

Enterprise-Scale Batch Processing

One very interesting aspect of this tool for converting PST files from Outlook is the ability for the tool to run on multiple threads at once. Instead of treating every PST file as its own separate task, the MailsWare Tool Kit processes them all in parallel, using parallel threads to perform the conversion on each of the separate PST files at the same time. This feature means that whether you are converting 500 average sized PST files, or 5000 average sized PST files, the conversion will not be stopped by one of the average sized PST files failing due to corruption. Because of all of the intelligent algorithms utilized within the PST converter, it is an excellent option for enterprise users, as well as performing batch PST file migration.

modern connectivity

Modern OAuth 2.0 and API Connectivity

Legacy PST conversion tools utilize simple authentication in combination with IMAP and/or SMTP protocols to connect with the source and destination to perform the migration of the PST files. The current state of enterprise security, in terms of the types of connectivity methods that are used, has rendered these types of connection methods obsolete and/or blocked by company security policies. The MailsWare PST Migration tool utilizes token-based authentication to connect to Outlook PST data for migration. The MailsWare PST Migration tool also supports token-based authentication through OAuth 2.0 for both Gmail and G Suite accounts, while using the Microsoft Graph API to connect to Office 365 for fast and secure migration of PSTs.

advanced recovery mode

Advanced Recovery Mode Option

MailsWare's PST Converter Tool works on the hexadecimal sector level rather than relying on high-level file headers for locating the corrupt files that the converter reads. This method does not produce any corrupt output files as MailsWare's PST Converter tool uses a raw data level scan for identifying corrupt PSTs, recovering those PSTs, and converting them into non-corrupt PSTs. The tool has its internally developed B-Tree node reconstruction to resolve corruption issues while converting Outlook PST files.

incremental/delta export
Incremental/Delta Export Functionality

To provide users with the ability to perform incremental and delta PST file conversion, MailsWare has incorporated the use of a specific filter logic combination, along with an accompanying log report. The user can use the log report to create manual filter settings based on folder names, dates, subjects, To's, From's, CC's, etc. The user will then utilize the filters through the use of the incremental and delta export functions.

digitally certified

SHA-256 Digitally Signed Executable

MailsWare's PST Converter Tool's executable file has a digital signature and is secured using the SHA 256 algorithm. The digital signature of the tool's executable file provides confirmation that MailsWare's PST converter is free from malware or undesired changes, and if the validation check fails, the digital signature will be removed.

auto Validation and reporting
Post PST Conversion Validation and Reporting

Once the conversion process of the Outlook data files is completed, MailsWare's toolkit will complete a second internal validation of the data transferred for ensuring that all PST data has migrated correctly. After the internal validation is completed, the software creates a log report which states: total number of items processed, number of items converted, number of items skipped/failed with a description of each of the errors (if there were any), and a path to the destination location. This log can be used as evidence of completing the internal validation process, compliance, and forensic purposes.

Used and Trusted By

MailsWare Outlook PST File Converter is Highly Trusted & Used By

it teams

IT Teams

compliance teams

Compliance Teams

legal firms

Legal Firms

home users

Home Users

Video

Video Tutorial to Convert PST Files

We are dedicated to aiding our customers

Review the PST file converter graph and rating.

Performance

97%

Customer Satisfaction

94%

Output Accuracy

99.99%

Specifications

System Requirements to Flawlessly Bulk Convert Outlook PST Files

Software Download

Download Now

Size : 50 MB

Version : 16.1

Trial Limitations

Limitations
The trial version of the free Outlook PST Converter software allows you to convert the first 25 items per folder from the source folder to multiple file types.

System Specifications

Hard Disk Space
500 MB of free hard disk space

RAM
Minimum 4 GB RAM

Processor
Intel® Pentium 1 GHz processor (2.4 GHz is recommended)

Supported Editions

  • Microsoft Windows – Windows OS 11 (64 bit), 10, 8, 7 (32 bit or 64 bit) & Windows Server 2025, 2022, 2019, 2016, 2012 R2, 2008, and all.
  • Mac OS: Mac OS 15 (Sequoia), macOS 14 (Sonoma), macOS 13 (Ventura), macOS 12 (Monterey), macOS 11 (Big Sur), macOS 10.15 (Catalina), macOS 10.14 (Mojave), etc.
  • Supported Variants: ANSI (American National Standards Institute) and Unicode.

Product Guides

Install & Uninstall

Refund Policy

Electronic Delivery

MailsWare PST file Converter Toolkit will be delivered automatically after confirming your payment. You will receive an email with a download link and activation key on your registered email address.

Feature Comparison

Features Difference Between Free Outlook PST Converter and Pro Version

Features

Trial Version

Full Version

Batch PST Conversion

Selective PST Folder Conversion

Convert selective folders

Internal PST Split Options

Convert ANSI PST to Unicode

PST Folder Name Language Translation

Convert PST Files to 38 Choices

Create a Separate PST Per User

Advanced Filter Settings

Convert Large PST Files

25 PST/ folder

According to License Variant

Price

Free

$29

100% Refund Policy

 Download

 Buy

Common FAQs

Frequently Asked Questions About MailsWare PST Converter Software

Despite technical features, the MailsWare converter for Outlook PST file conversion comes with a simple and 5-step process tool. Users simply need to follow the 5 steps to batch convert PST files.

  • Step 1: Run the tool and add Outlook data files.
  • Step 2: Select PST folders for conversion.
  • Step 3: Choose the output option and destination path.
  • Step 4: Apply filter settings for selective PST items conversion
  • Step 5: Press the Convert button to start the Outlook data file conversion

The MailsWare toolkit works on a raw data read and write algorithm; the software directly reads hex data for the conversion process. Therefore, this application does not require Outlook installation for its working and helps to avoid MAPI-related errors.

The zero-knowledge architecture of the tool works as a standalone desktop-based application that uses your machine RAM and CPU for processing. Due to this architecture, your data never leaves a machine and is strictly converted behind the firewall.

The software is well-engineered to handle non-English characters (including Unicode, double-byte and special characters). The MAPI property mapping ability of the tool ensures that any non-English character encoding is preserved and prevents metadata corruption during PST migration.

To verify the converted data integrity, the post-validation and reporting functionality provides a detailed saving log report. You check the log report.txt to verify the data integrity of your converted data.

Unlike legacy PST converters that use less secure app access (App password) or general SMTP/IMAP protocols for migration. The MailsWare toolkit for Outlook migration uses a token-based authentication protocol. The software uses the latest OAuth 2.0 for PST to Google Workspace or Gmail migration and Graph API for migrating PST to Outlook.com or Office 365.

Client Testimonials

What Our Customers Say About Outlook PST Converter Tool

In a compliance environment, data privacy is negotiable for us. MailsWare toolkit for Outlook PST conversion, Zero Knowledge Architecture is the prime reason to choose this tool. Knowing the local processing capability of the tool that ensures our data never leaves our machines provides the security power that we require.

Daniel Duck

Daniel Duck

Compliance Officer, USA

We need to move 100 GBs of PST archive to a modern cloud environment without bypassing our MFA protocol. The MailsWare toolkit for Outlook PST converter handles all with its integration to modern authentication protocols like OAuth 2.0 and Graph API. Due to this, we achieved a secure token-based migration that satisfies our internal IT security policies.

Mark Roger

Mark Roger

IT Architect, Germany

We had over 2 TB of legacy PST files that we needed to migrate. The online PST converter is hitting a massive latency issue. Then, we find the MailsWare Outlook PST converter tool. The multithread and concurrent processing algorithm of the tool helps us to successfully migrate 2 TB of PST files without a single error.

Donal Luie

Donal Luie

Senior Migration Specialist, Japan