SysInfo PST Converter Software Guide

Procedure to Convert PST Files in Different File Format and Email Clients

  Installation   Uninstallation

Software Guide

Introduction

Meet the top-notch SysInfo PST Converter, a complete solution to convert, migrate, or backup your large, corrupted, or incompatible PST files into multiple file formats and email clients. It allows the operation without the Microsoft Outlook dependency. Offers numerous advanced features such as date range and folder-based email filtering, removal of duplicates, separate attachments, and more. This SysInfo PST File Converter Tool converts every piece of information, including the folder structure, exactly as it was in the original file.

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PST Compatibility with Microsoft Outlook

PST is a primary data file of Outlook, which is used to store emails, contacts, calendars, tasks, and attachments. PST files are of two types (ANSI or UNICODE ), and their compatibility depends on the Outlook version.

PST Compatibility with Different Outlook Versions

Outlook Version Release Year PST Type Supported Max File Size Limit
Outlook 97 – 2002 1997 – 2002 ANSI PST 2GB
Outlook 2003 – 2007 2003 – 2007 UNICODE PST 20GB
Outlook 2010 – 2016 2010 – 2016 UNICODE PST 50GB (default extendable)
Outlook 2019 2018 UNICODE PST 50GB+
Outlook 2021 / Office 365 2021 – Present UNICODE PST 100GB+ (depends on system & policy)

Timeline Summary

  • Before 2003: Supports ANSI PST and offers a small storage capacity with limited language support.
  • After 2003: Supports UNICODE PST and offers large storage capacity, global compatibility, and modern structure.
Note: You can still open PST files of older versions in the new version, but you cannot open new version files in older versions.

Key Features of Outlook PST Converter

Core Features Advance Features
PST File to Popular Format
Convert PST files in multiple formats. Including MBOX, EML, EMLX, MSG, PDF, CSV, XLSX, GIF, JPG, TIFF, HTML, MHTML, PNG, DOC, DOCX, DOCM, VCF, ICS, and JSON. 		Export PST to Cloud Platform
Allows you to export your PST file directly to cloud platforms. Including Gmail, Office 365, Yahoo, AOL, Hotmail, G Suite, Zoho, Yandex, iCloud, and IMAP accounts.
Supports ANSI and UNICODE
This PST Converter ensures compatibility with all versions of Outlook, including Outlook 97–2021 and Microsoft 365. 		Split Large PST Files
The Outlook Converter divides the PST files into smaller parts by size to prevent corruption or manageability issues.
Batch Conversion
Add and convert multiple PST files in a single process. Whether exporting or converting, the batch facility helps you manage your data easily within the software. 		Date Range Filter
Convert files of only a specific period by applying the date range. You can choose Start and End Date and ensure the emails for only a particular time are moved automatically.
Maintain Folder Hierarchy
Outlook Data File Converter Tool ensures that your original folder structure and email data integrity remain intact. Also, the folder structure is preserved the same as the original PST file. 		Include/Exclude Attachments Option
PST Converter Wizard gives you complete control to choose to include or exclude attachments during the conversion. You can even decide to store them separately or save them in another format as desired.
Preview Email and Attachments
The SysInfo PST Converter offers an exclusive feature to preview your emails and attachments in different views before the conversion. 		Save Duplicate Emails Option
The excellent Outlook Converter can save the output file at your defined location while maintaining the data hierarchy.
User-Friendly Interface
Provides a simple user interface, making it beginner-friendly with simple steps. 		Smart Naming Convention
Offers you to customize your output file name for better organization and management.
Free Demo Version
Offers a Free Demo Version to convert 50 emails per folder at no cost. It is also useful for evaluation and performance checks. 		Log Report Generation
After each conversion and migration user receives a summary file with this software that you can easily open with MS Excel for checking.
No Outlook Installation Required
The user doesn't need to install Outlook while using the SysInfo PST Converter Tool. 		Export All Emails in CSV File
Exports all selected emails in CSV format for analysis and record-keeping in the future.

Simple Steps to Convert PST File to Other Formats

The SysInfo PST Converter Tool is a viable utility to convert/migrate PST files. Effective in turning bulky, large PST files into a clean and accessible format easily. Follow these steps to achieve the task successfully:

Step 01: Download PST Converter as Administrator

Follow the given steps to use the PST Converter Wizard on your desired operating system.

  1. Visit the Official Site: Go to the official website of SysInfo and download the PST Converter Tool to get the latest version.
  2. Set up and Run Tool: Open your ”Downloads” folder, find the setup file, right-click on it, and select “Run as Administrator”.
  3. Launch the Tool: If you opted for the Demo Version, follow the on-screen instructions and open the tool on your desktop.
  4. Activation: If you purchased the Licensed Version, then activate the software first and then continue with the guide below.
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Step 02: Select Single/Multiple Files or Select Folder

Here, you have to select between a single file and multiple files, or a whole folder, as per the requirement. Then click Next to proceed.

  • Single File/Multiple Files: Use this option to select single or multiple PST files.
  • Select Folder: This option helps you select a whole folder at once containing multiple PSTs.
  • Save Log: It is the path of your log file, which stores each action performed by the user.
  • Temp Path: This is used to store the temporary files in the given location.
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Note: Click Live Chat at the top right corner of your wizard. If you find any type of issues, get instant and real-time assistance from our technical support team.

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Step 03: Add PST File or Folder

Add your PST file or folder from your local system by using the following option, and click Next to move forward.

  • Select Files: This is used to select single or multiple Outlook PST files.
  • Select Folder: This option helps you select a whole folder with PSTs rather than selecting each PST file.
  • Remove: By using this option, you can remove an accidentally added Outlook file, one at a time.
  • Remove All: This feature removes all added Outlook data files in just one click.
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Step 04: Select Files and Preview Email Body & Attachments

Select the files or folders you want to convert or migrate, and preview their email body and attachments. Click Next to proceed. Try the following options as needed:

  • Search Tree Content: It helps you to find content from the tree structure.
  • Search Table Content: This is used to find the specific data from the list of table content.
  • Email Body: Using this feature, you can view the email body and the metadata.
  • Attachment: It allows you to view the attachment with the email.
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Note: By checking the checkbox “If you want to preview on browser”, it redirects you to your browser for the preview of the selected email.

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Step 05: Choose the Desired File Format

Choose the file format in which you want to convert your PST file. The SysInfo PST Converter Tool provides more than 15+ File Formats. We are proceeding with the PDF file format. Each file format is used in different scenarios and purposes. Let’s see each file format for better understanding:

  1. PST (Personal Storage Table): It is ideal for Microsoft Outlook data backup or migration.
  2. MBOX (Mailbox): It is used by Apple Mail, Thunderbird, Eudora, etc, to store email from a mailbox.
  3. EML (Email Message File): It saves individual emails or attachments for single message sharing.
  4. EMLX (Email Message File MacOS): This format is similar to EML, but it is optimized for Apple Mail.
  5. MSG (Message File): Stores a single email with all properties.
  6. THUNDERBIRD: It is used for local email storage.
  7. PDF (Portable Document Format): Universal and secure file format for sharing and printing.
  8. CSV (Comma-Separated Values): Used to export contact and email lists in tabular form.
  9. XLSX (Excel Spreadsheet (XML-based)): Structured format to store analytical data.
  10. GIF (Graphics Interchange Format): It supports simple animations
  11. JPG (Joint Photographic Group): Used for compressed high-quality images.
  12. TIFF (Tagged Image File Format): Stores high color depth images used for professional photographs.
  13. HTML (HyperText Markup Language): Save or view emails in a web-compatible format.
  14. MHTML (MIME HTML (Multipurpose Internet Mail Extension HTML)): Saves an entire email with its resources.
  15. PNG (Portable Network Graphics): Used for screenshots, logos, and visual elements.
  16. DOC (Document (Microsoft Word format)): Used to save emails in an editable text file.
  17. DOCX (Document XML (Microsoft Word Open XML Format)): Useful for documentation and reports.
  18. DOCM (Document Macro-Enabled): Word macro document for automated reports or scripts embedded in Word files.
  19. VCF (Virtual Contact File): Used to store and share contact details.
  20. ICS (iCalendar File (Internet Calendar Scheduling)): Saves and imports calendar events over email platforms
  21. JSON (JavaScript Object Notation): Lightweight format for structured data exchange.
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Step 06: Apply Features and Filters

After choosing the file format, use the features and filters to simplify the process with accuracy and data safety. These features save time and effort and improve flexibility.

Here is the description of each feature and filter in brief:

  1. Remove Duplicate Mail: This tool removes duplicate emails on the basis of Sender, Recipient, Subject, Bcc, and Message Body. Deduplication provides more storage capacity.
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  2. Save in Same (Source and Destination Folders are Same): This feature saves converted files in the same folder as the original source of PST. It helps with easy and quick access.
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  3. Maintain Folder Hierarchy: It keeps the original folder structure intact after the conversion or migration of Outlook PST files in the desired format.
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  4. Save Attachment Separately: Allows you to extract and save attachments (documents, embedded images, etc.) separately from the email content.
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  5. Migrate or backup Emals Without Attachment Files: Exclude attachments while migrating to reduce file size and speed up the process.
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    Note: You can only choose Save Attachment Separately, or Migrate or backup Emals Without Attachment Files at a time.

  6. Extract All Emails in a CSV File: Exports all selected emails in CSV format for analysis and record-keeping.
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  7. Skip Previous Migration: Allows you to skip the previously migrated files to enhance efficiency and speed.
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  8. Create a Single PDF for Each Folder: Generates different PDF files for each email folder. It is useful for better organization and data management.
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  9. Date Filter: Select a specific time range (Start Date and End Date) to migrate only necessary emails. The software automatically converts data for the particular period.
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  10. Naming Convention: Provides customizable naming patterns to organize exported emails. For instance: Subject_Date(DD-MM-YYYY), Date(MM-DD-YYYY)+From, From+Subject+Date(YYYY-MM-DD), etc.
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  11. Custom Folder Name: Allows you to rename the output folder as per your desire. Say, “PST to PDF File”
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  12. Path to Save: You can choose a custom location to save the output file on your OS.
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Step 07: Start the Conversion process

After applying the required features, click on the Convert button to start the process of conversion.

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  • During the conversion process bar will appear, which will show the process status in real time. Do not close the wizard or switch off the device to avoid miscellaneous errors or an incomplete result.
  • Stop: Clicking the Stop button immediately halts all ongoing transfers, such as emails, files, or folders being migrated from one account to another.
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  • When the process is completed, a pop-up will appear that says “Process has been successfully completed.” Click OK and proceed ahead.
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Step 08: Download Report

After the process completion, the SysInfo PST Converter Tool generates a report that contains a complete summary of the process. It includes From, To, File name, Status, Duration, Message count, Path, and Total messages.

You will get the following action buttons here:

  1. Convert Again: This will allow you the start a new conversion and redirect you to the preview panel.
  2. Download Report: It will download your report file for your process in CSV format.
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Quick Steps to Migrate PST Files to Email Clients

Here, we are going to discuss the migration of the PST file into email clients. In this process, the first 4 steps will remain the same, and we will start from step 5, where we will proceed with the example of Office 365.

Step 05: Choose the Email Client

After selecting and previewing your emails, select the email client in which you want to migrate your files. This tool is an efficient utility for migration to email clients with 100% accuracy.

Here are all the supported email clients by the SysInfo PST Converter Tool. Understand in detail:

  1. Office 365: It is a cloud-based suite by Microsoft that includes Outlook, Word, Excel, OneDrive, Teams, and more.
  2. Gmail: The most popular free and paid email service by Google, which offers 15 GB of storage.
  3. G Suite (Google Workspace): It is the business version of Gmail, which provides a custom domain email facility.
  4. Yahoo Mail: A user-friendly, long-standing email service by Yahoo with 1 TB of free storage.
  5. AOL (America Online): A free email service by AOL, popular for its unlimited storage.
  6. Hotmail: This is Microsoft’s original webmail service, which is now rebranded as Outlook.com.
  7. IMAP (Internet Message Access Protocol): It is a mail access protocol that lets users read emails directly from the server.
  8. Zoho Mail: A professional, ad-free email service by Zoho Corporation.
  9. Yandex Mail: It is the free and secure email platform from Yandex Russia’s largest tech company.
  10. iCloud: Official email service of Apple for macOS and iOS users.
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Step 06: Log in to Email Client

Here, we will enter the login credentials of the Office client to log in. Similarly, you have to use the credentials of another email client if you are logging in with any other email client.

Here we have three login options to log in to email clients:

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  1. Login with Client Secret ID: This method uses Microsoft’s secure OAuth 2.0 authentication to connect your Office 365 account without entering your password directly. Instead, it relies on a Client ID and Client Secret generated from the Microsoft Azure Active Directory (App Registration) section.

    2. Get the Client Secret ID credentials - Client Secret ID login credentials.

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  2. Modern Authentication: It is Microsoft’s secure, token-based login system that uses the OAuth 2.0 protocol instead of traditional username-password methods. It allows applications to access Microsoft 365 services without storing or transmitting passwords.

    3. A. Enter your email address and click on Sign in

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    B. Then choose your account.

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    C. Enter your password and click Sign in.

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  3. Basic Authentication: It is a variation of standard Basic Authentication used by email services that require enhanced security. Instead of using your main email password, you use an App Password, which is a special one-time password generated for apps or devices.
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How to Create App Passwords?

Gmail Yandex Mail
Zoho Mail HotMail
Yahoo Mail iCloud
Office 365 AOL

Step 07: Apply Features and Filters

After logging in successfully, you will see multiple features and filters to make your migration accurate, secure, and time-efficient. Below are the descriptions of each feature:

  1. Remove Duplicate Mail: This tool removes duplicate emails on the basis of sender, recipient, subject, BCC, and message body. Thus, it provides you with more storage and unique emails.
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  2. Mapping to Existing Folder: This feature allows you to import PST data into already existing folders within the target Office 365 mailbox.
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  3. Migrate or Backup Emails Without Attachment Files: Exclude attachments while migrating to reduce file size and speed up the process.
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  4. Date Filter: Select a specific time range (Start Date and End Date) to migrate only necessary emails for a particular period.
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  5. Custom Folder Name: Allows you to rename the folder based on your preference for easy lookup. Say, “PST Data Files” or “O365”
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Step 08: Start the Process

Click the Convert button in the bottom right corner to start the migration process.

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  • The process bar will appear, which will show the process status in real time. Do not close the wizard or switch off the device, otherwise it can lead to errors or an incomplete result.
  • Stop: Clicking the Stop button immediately halts all ongoing transfers, such as emails, files, or folders being migrated from one account to another.
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  • When the process is completed, a pop-up will appear that says “Process has been successfully completed.” Click OK and proceed ahead.
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Step 09: Start the Process

After the process completion, the SysInfo PST Converter Tool generates a report that contains a complete summary of the process. It includes From, To, File name, Status, Duration, Message count, Path, and Total messages.

You will get the following action buttons here:

  1. Convert Again: This will allow you the start a new conversion and redirect you to the preview panel.
  2. Download Report: It will download your report file for your process in CSV format.
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Why Choose SysInfo PST Converter Tool?

The SysInfo PST Converter Tool stands out as a powerful, all-in-one solution for simplified Outlook data conversion and migration. Designed for both professionals and everyday users, it ensures a secure, accurate, and effortless transfer of PST files into multiple formats and platforms like Office 365, Gmail, Thunderbird, Zoho, and Yahoo Mail. Its advanced filters, including date range selection, duplicate removal, and attachment management, give you complete control over what gets migrated, maintaining the original folder hierarchy and data integrity.

Key Benefits

Streamlined Compatibility Guaranteed Data Accuracy & Security Productivity & Scalability
Effortlessly convert PST files into multiple formats (like MBOX, EML, PDF, MSG, etc.) and email clients (Gmail, Hotmail, iCloud, etc.) to ensure universal accessibility across platforms and email clients without data loss or formatting errors. Preserve complete mailbox integrity, including emails, attachments, metadata, and folder hierarchy, through precise conversion algorithms and built-in protection against corruption or tampering. Accelerate large-scale migrations with batch conversion and automation capabilities, reducing manual effort while ensuring smooth handling of gigabyte-sized PST files for enterprise deployments.

System Requirements

Core Requirements

Processor: Intel® Core™2 Duo E4600 Processor 2.40GHz

Ram: 8 GB (16 GB Recommended)

Disk Space: Minimum Disk Space – 512 GB

Support Outlook Versions: Office 365, 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98, and 97.

Supported Windows: 11, 10, 8.1, 8, 7, 2008/2012 (32 & 64 Bit), and other Windows versions. 		About Product

Version: 25.10
Size: 253 MB
License: Multiple User
Release Date: October 2025
Edition: Home, Administrator, Technician, and Enterprise
Supported Output File

PST, MBOX, EML, EMLX, MSG, PDF, CSV, XLSX, HTML, MHTML, GIF, JPG, TIFF, PNG, JSON, DOC, DOCX, DOCM, VCF, ICS, and Thunderbird. 		Supported Output Clients

Gmail, Office 365, Yahoo, AOL, Hotmail, G Suite, Zoho, Yandex, iCloud, and IMAP accounts.

Installation Guide

Step-by-Step Installation Guide Trial Version Features & Important Notes

Step 1: Download the Software
Go to the official SysInfo website and download the PST Converter Tool from the downloads section.

Step 2: Run the Installer
Find the downloaded setup file on your system, right-click it, and choose Run as Administrator. Follow the on-screen instructions in the installation wizard.

Step 3: Complete the Setup
Select the desired installation directory, review and accept the license agreement, then click Install to complete the setup. A desktop shortcut will be created automatically.

Step 4: Launch the Application
Open the tool from the desktop shortcut or Start menu. Once launched, the software will initialize and display its main user interface for use.
Trial Version Features

What You Can Do with the Trial Version
✓ Preview Data Before Conversion.
✓ Test All Features and Filters.
✓ Convert Limited Emails per Folder.
✓ Check Compatibility and Performance.

What You Cannot Do with the Trial Version
✗ Full Data Conversion.
✗ Bulk or Batch Migration.
✗ Save All Data Outputs.
Important Notes

  1. System Requirements Check.
  2. Stable Internet Connection for Cloud Migration.
  3. Check Disk Permissions & Path Length.
  4. Avoid Special Characters in Paths or File Names.

TroubleShooting Guide

Common Issues with Solution Advance Troubleshooting

Software is not launching properly

Possible Cause: Missing system permissions or corrupted setup files.

Quick Solution: Run the program as Administrator or reinstall the tool from the official SysInfo website.

PST file not loading or detected

Possible Cause: PST file is corrupted, password-protected, or too large.

Quick Solution: Use the Repair PST Tool to repair the file before conversion, or unlock the PST file in Outlook.

Conversion process stuck or frozen

Possible Cause: Low RAM or system resources during large file conversion.

Quick Solution: Close other applications and re-run the conversion with smaller PST segments.

Error during export to Gmail/Office 365

Possible Cause: Two-factor authentication (2FA) or app password disabled.

Quick Solution: Enable App Passwords or use Modern Authentication (OAuth 2.0) for secure login.

API Login Failure (Office 365, Gmail, Zoho, etc.)

Technical Reason: Expired tokens, blocked IPs, or misconfigured OAuth credentials.

Fix or Workaround: Re-authenticate using Modern Authentication; ensure your client secret and tenant ID are valid in Azure or Google Cloud Console.

Office 365 Throttling or Timeouts

Technical Reason: Microsoft server-side restrictions for bulk migration.

Fix or Workaround: Limit concurrent connections or migrate data in smaller batches.

OAuth token expired during migration

Technical Reason: Long-running migration sessions.

Fix or Workaround: Reauthorize the account or refresh the token in settings before resuming migration.

Exported files are not opening in the target client

Technical Reason: Unsupported encoding or format mismatch.

Fix or Workaround: Verify target client supports the chosen export format (e.g., .EML vs .MBOX).

When to Contact Support?

You should contact SysInfo PST Converter Tool support whenever you encounter issues that cannot be resolved on your own. This includes installation errors, PST file loading problems, conversion failures, or incomplete/missing data, as well as cloud migration or authentication issues with Office 365, Gmail, or other email platforms. Support can also assist with clarifying advanced features, handling large PST files, license activation problems, or any unexpected software errors or crashes. Before reaching out, have your software version, system details, PST file info, and steps taken ready to ensure quick and accurate assistance.

Pro Tips

Before contacting support, make sure you have:

  • Software version and system details.
  • PST file type, size, and Outlook version.
  • Steps have already been taken to resolve the issue.

Note: This helps the support team provide faster and more accurate solutions.

Support & Privacy Information

Professional Support Channels Data Privacy & Security

Email Support
Comprehensive technical support via email with detailed responses.
Email: sales@sysinfotools.com
Response Time: 4–8 business hours

Phone Support
Direct phone consultation with certified technical experts.
Availability: Mon–Fri, 9:00 AM – 6:00 PM (IST)
Phone: +91-9773820439 (India), +91-8130504313 (India)

Live Chat Support
Real-time chat assistance for immediate troubleshooting.
Response: Instant
Availability: 24/7 for premium users
Contact: Get Instant Support

Technical Expert Team
Dedicated experts specializing in Outlook PST conversion, email migration, and data integrity.
Expertise: Microsoft-certified professionals
Coverage: Installation, configuration, migration, and troubleshooting
Languages: Multi-language support available

Zero Data Storage Policy
The tool ensures that no user data, email content, or attachments are stored on external servers during conversion or migration.

Data Privacy Maintenance
End-to-end encrypted communication during cloud migrations.
Direct connection to target email platforms (Office 365, Gmail, etc.)
No intermediate caching of user data.

Compliance
Compliant with GDPR and other international privacy standards.

Authentication Security
Uses secure OAuth 2.0 and OpenID Connect protocols for Office 365 and other cloud services.
No credentials are stored locally or remotely.
Supports Multi-Factor Authentication (MFA) for added security.

Audit & Compliance
All operations are logged for internal audit purposes.
Logs include operational metadata only, without any personal email or file content.
Support Request Process

Submit Request: Contact support via email, phone, or live chat with detailed issue information.

Expert Assignment: A technical expert is assigned based on the issue’s complexity.

Follow-Up: Comprehensive analysis and implementation of a solution.

Close Loop: Verification of resolution and customer satisfaction.

Frequently Asked Questions

Ans:  Yes, the tool is completely safe. It works locally on your system, maintains the integrity of your PST files, preserves folder hierarchy, and ensures no data is altered or lost during conversion.

Ans:  The tool supports multiple export formats, including MBOX, EML, EMLX, MSG, PDF, DOC, DOCX, HTML, CSV, ICS, VCF, JSON, and others for flexible migration and backup.

Ans:  Yes, the tool supports large and oversized PST files, including Unicode and ANSI formats. There is no risk of corruption during the conversion process.

Ans:  Yes, advanced filters like Date Range, Remove Duplicate Emails, Exclude Attachments, Folder Selection, and Naming Conventions allow precise control over what gets migrated.

Ans:  Yes, it is compatible with all Outlook versions from Outlook 97 to 2021, including Office 365 accounts.

Ans:  Yes, the tool provides an option to extract and save attachments independently during conversion, helping manage storage efficiently.

Ans:  Yes, the tool allows direct migration to cloud platforms using secure OAuth 2.0 authentication for Office 365, Gmail, Zoho Mail, Yahoo Mail, and more.

Answer:  The conversion time depends on the size of the PST file, the number of emails, and the selected output format. Smaller PST files (less than 1 GB) usually take only a few minutes, while larger files may take longer to process.

Sales Frequently Asked Questions

Ans:  You can purchase using major credit/debit cards, PayPal, and wire transfer through our secure payment gateway.

Ans:  No, the price shown on our website is final. Applicable taxes are clearly displayed during checkout.

Ans:  You can contact our sales team at sales@sysinfotools.com to request an upgrade by paying only the difference between license types.

Ans:  It usually takes 24–48 business hours after payment confirmation to receive your license key.

Ans:  SysInfo offers four types of licenses – Single User, Administrator, Technician, and Enterprise, each designed for specific user needs.

Ans:  Yes, the license is perpetual. Once purchased, you can use it for a lifetime with free updates for a limited period.

Ans:  The software and license key are delivered digitally to your registered email address. No physical delivery is required.

Ans:  Online purchase through a credit/debit card or PayPal provides instant license delivery to your email.

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