Every Byte Matters.
DT Outlook PST Converter
Convert or Migrate Outlook PST Files, Healthy or Corrupted
Turn PST data into MBOX, PDF, EML, MSG, CSV or VCF, or migrate directly to Office 365, Gmail, Google Workspace, Zoho Mail and IMAP.
Every Outlook PST file eventually needs to go somewhere Outlook itself can't take it, a different file format, a different email client, or a completely different mailbox. A PST converter handles the first case, turning PST data into MBOX, PDF, EML, MSG, CSV or VCF. PST migration handles the second, moving that same data directly into a live mailbox such as Office 365, Gmail, Google Workspace, Zoho Mail or any IMAP server, no intermediate file involved. Most people searching for a "PST converter" actually need one of these two things, and often both in the same project.
Quick Summary:This tool does both, in one graphical interface, on a healthy PST file or a corrupted one, without requiring Microsoft Outlook to be installed at any point.
Key Features at a Glance
Convert to 6+ formats: MBOX, PDF, EML, MSG, CSV and VCF, covering everything from email client migration to legal archiving and contact export
Migrate directly to live mailboxes: push PST data straight into Office 365, Gmail, Google Workspace, Zoho Mail, Outlook.com and any IMAP-enabled server, no manual import step
Reads corrupted PST files: a built-in recovery engine repairs damaged headers before conversion or migration starts, no separate repair tool needed
No file size limit: tested on PST files well over 100GB, multi-threaded processing prevents crashes on large files
GUI-based batch processing: load an entire folder of PST files into a visual queue and convert or migrate all of them without a command line
ANSI and Unicode support: every Outlook version from 2007 through 365
Preview before export: browse folders, emails, contacts, calendars and attachments before anything moves
Granular filtering: by date range, folder, sender or item type, so only what's needed gets converted or migrated
100% local processing: the file never leaves the device, nothing is uploaded to any server
Full conversion/migration report: every item logged as processed, skipped or flagged, exportable as CSV
What a PST File Is, and Why It Needs to Move
A PST file (Personal Storage Table) is what Microsoft Outlook uses to store a mailbox, emails, contacts, calendar entries, tasks and attachments, all inside one file. It works until something forces a change: Outlook stops opening it, a new machine arrives without Outlook installed, a company account is scheduled for deletion before anyone exports what's inside, or the actual goal is to leave Outlook altogether for Gmail, Office 365, Thunderbird or another platform.
That last scenario is where "converter" and "migrator" searches usually overlap. Some people need the data in a new format. Others need the mailbox itself moved into a new, working inbox. This tool is built to answer both without forcing a choice upfront.
Works on a Healthy PST File or a Corrupted One
Healthy PST file
The file opens fine, but the data needs to move into a different format or a different mailbox entirely. Add the file, choose a format or a migration destination, and run it. Folder structure, attachments and metadata carry over exactly as they exist in the original.
Corrupted PST file
Outlook throws an error, or refuses to open the file at all. In most cases the data isn't gone, it's just unreachable through Outlook's own reader. A built-in recovery engine scans and repairs damaged PST headers automatically before conversion or migration begins. Most partially corrupted PST files can be fully recovered this way, with no separate repair utility required.
A Visual Interface Built for Batch Work, Not a Command Line
Some PST tools push anything beyond a single file toward scripts and command-line flags. This one keeps every capability, including bulk conversion and bulk migration, inside the same graphical interface used for a single file.
Loading a whole folder of PST files puts them into a visual queue, where each file shows its size, condition and status as processing runs. Output format (or migration destination) and filters can be set once and applied across the entire batch, and progress for each file is visible in real time. An IT admin migrating eighty mailboxes to Office 365 in one session gets the same point-and-click workflow as someone converting a single personal PST file to PDF, just with more rows in the queue.
Built for Individual Use and for Larger Deployments
For individual use
Install on one machine, add a file or a folder, and convert or migrate. No account, no license server, no setup beyond the installer.
For teams and organizations
Multi-seat and volume licensing are available for department-wide rollouts, whether the project is a one-time PST-to-PDF archive or a full company migration to Office 365 or Google Workspace.
Two Ways to Move PST Data: Convert or Migrate
Convert PST Into a File Format
Use this when the PST needs to become a portable file, not a live inbox: a client leaving a job who needs a permanent record, a legal team archiving emails for e-discovery, or someone switching to a desktop client like Thunderbird or Apple Mail that reads MBOX rather than PST.
PST to MBOX
Thunderbird, Apple Mail, a local Gmail setup, or any non-Outlook client
PST to PDF
Legal records, compliance archives, court submissions, timestamped and unalterable
PST to EML
Individual, single-file emails readable across nearly every email client
PST to MSG
Staying inside the Microsoft ecosystem while storing emails outside the mailbox
PST to CSV
Contacts and calendar data, for import into Google Contacts, a CRM, or Excel
PST to VCF
Outlook contacts moving to a new phone, Gmail, or any modern address book
Migrate PST Directly Into a Live Mailbox
Use this when the goal is a working inbox on a new platform, not a file. The tool connects to the destination and writes emails, contacts, calendars and folder structure straight into it, no export-then-import step, no intermediate MBOX or CSV file sitting on disk in between. Folder hierarchy, read/unread status, attachments and metadata (To, From, Cc, Bcc, Subject, Date) carry over intact in both directions, whether the destination is a file on disk or a live mailbox.
Migrate PST to Office 365 / Microsoft 365
For organizations moving off local Outlook profiles onto a hosted Exchange Online mailbox
Migrate PST to Gmail / Google Workspace
For individuals and teams switching to Google's ecosystem
Migrate PST to Zoho Mail
For businesses standardizing on Zoho's suite
Migrate PST to Outlook.com / Hotmail
For a straightforward move within Microsoft's own consumer webmail
Migrate PST to any IMAP server
For self-hosted mail, Yahoo Mail, AOL Mail, or any provider that speaks IMAP
Converting or Migrating a PST File in 4 Steps
Install on a Windows PC
No internet connection is needed after installation, and no account or sign-up is required.
Add the PST File
Drag in a single PST file, or load an entire folder into the batch queue. The tool reads it immediately, regardless of file size or condition.
Preview, then Choose Format or Destination
Browse every folder, email, contact and attachment before anything moves. Filter by date range, folder or item type, then pick an output format (MBOX, PDF, EML, MSG, CSV, VCF) or a live migration destination (Office 365, Gmail, Google Workspace, Zoho Mail, IMAP).
Run It and Review the Report
A full report lists every item converted or migrated, skipped, or flagged, exportable as CSV for recordkeeping.
Why This Runs Entirely on Your Own Machine
A PST file usually holds years of email history, client conversations, personal messages, legal documents and attachments most people forgot they had. Most online PST tools require uploading that file to a server before anything happens.
This tool doesn't work that way, and can't, because there's no server-side step to upload to. Reading, conversion and migration all happen on the device running the software; even a direct migration to Office 365 or Gmail is authenticated and pushed from the local machine, not routed through a third-party server in between.
100% local processing
Everything happens on-device, no upload, no cloud step
No internet required for conversion
File-format conversion runs fully offline; live migration naturally needs a connection to the destination mailbox
Auto-resume on interruption
A power cut or restart mid-job picks back up where it left off
Full report
Every item logged as converted/migrated, skipped, or flagged
The Situations Most PST Tools Give Up On
A PST file over 500GB
No size limit enforced; a multi-threaded engine processes large files without crashing or requiring a split first
Converting or migrating dozens of PST files at once
A batch queue loads a whole folder and processes all of them in one session through the same GUI
A partially corrupted file
Built-in recovery mode repairs file structure automatically before extraction
An old ANSI-format PST from early Outlook
Both ANSI and Unicode PST files are supported, covering Outlook 2007 through 365
Migrating without duplicating existing mailbox items
Filtering and selective export mean only the emails that are actually needed get pushed to the destination
Who Actually Uses This
Switching from Outlook to Gmail, Thunderbird, or Office 365
Convert to MBOX for desktop clients, or migrate directly into a live Gmail or Office 365 mailbox with folders and attachments intact
Leaving a job with a closing email account
Export everything to PDF or EML before access ends, or migrate the mailbox straight into a personal account
An old PST file Outlook refuses to open
Too large, too old, or corrupted, read independently of whatever state Outlook itself is in
Legal and compliance archiving
Convert a specific date range to PDF, a timestamped, unalterable record ready for e-discovery or audit
IT teams handling a company-wide move
Batch-process hundreds of PST files, whether the destination is a shared folder of PDFs or every employee's new Office 365 mailbox
Developers and forensic reviewers
EML and MSG exports provide clean, individual files suited to structured review
Demo vs Full Version
The demo runs the complete tool exactly as the full version does, conversion, migration, corrupted-file recovery, batch queuing and preview all work identically. The only limit is how much of each folder can actually be exported or migrated.
| Feature | Demo Version | Full Version |
|---|---|---|
| Add PST files for processing | Included | Included |
| GUI batch queue for multiple files | Included | Included |
| Preserve folder structure | Included | Included |
| ANSI and Unicode PST compatibility | Included | Included |
| Convert PST to any file format | Up to 40 items per folder | No limit |
| Migrate PST to Office 365 / Gmail / IMAP | Up to 40 items per folder | No limit |
| Price | Free | Paid |
System Requirements
| Software Version | 25.7.4 |
| Software Size | 33 MB |
| Operating System | Windows 11, 10, 8.1 |
| Interface | Graphical (GUI), no command line required |
| Outlook Required | No, completely independent |
| PST Types Supported | ANSI and Unicode, all Outlook versions |
| Outlook Versions Covered | 2007, 2010, 2013, 2016, 2019, 2021, 365 |
| Processor | Intel Pentium 1 GHz or higher |
| RAM | 4 GB recommended |
| Disk Space | 200 MB for installation |
What Real Users Say
"Moving 15 years of old Outlook emails to Gmail seemed impossible until we found Data TB. Their PST Converter moved all 40GB of emails with exact folder structures and attachments intact in just a few hours."
Marcus Vance
Small Business Owner
Verified by Data TB
"We had a corrupted 80GB PST file that Outlook refused to open. DT PST Converter repaired the headers and extracted all emails to PDF format effortlessly."
David Chen
IT Administrator
Verified by Data TB
"Converted thousands of PST files to MBOX for our company-wide Thunderbird migration. The batch processing and audit log saved us days of manual work."
Sarah Jenkins
Operations Director
Verified by Data TB
Frequently Asked Questions
QDo I need Microsoft Outlook installed to use this?
ANo. The tool reads PST files with its own engine, independent of Outlook, for both format conversion and live migration.
QWhat's the difference between converting and migrating a PST file?
AConverting turns the PST into a different file, MBOX, PDF, EML, MSG, CSV or VCF, that can be opened by other software. Migrating pushes the same data directly into a live mailbox, like Office 365 or Gmail, without creating an intermediate file.
QCan this tool migrate PST files straight to Office 365?
AYes. PST data, including folder structure and attachments, can be migrated directly into an Office 365 or Microsoft 365 mailbox without going through a separate file first.
QCan I migrate a PST file to Gmail or Google Workspace?
AYes. PST content can be migrated directly into a Gmail or Google Workspace mailbox, or converted to MBOX first and imported manually, whichever fits the workflow better.
QMy PST file is corrupted. Can it still be converted or migrated?
AIn most cases, yes. A built-in recovery mode scans and repairs damaged file structures automatically before extraction, so most partially corrupted PST files can still be fully processed.
QIs there a file size limit?
ANone. The tool has been tested on PST files over 100GB, and multi-threaded processing prevents large files from crashing during either conversion or migration.
QCan I convert or migrate multiple PST files at once?
AYes. A GUI batch queue allows an entire folder of PST files to be added and processed in a single session, without any scripting.
QDoes the PST file get uploaded to any server during migration?
ANo. Processing happens on the local device; a live migration authenticates directly with the destination mailbox (Office 365, Gmail, or IMAP) from that machine, with no third-party server in between.
QWill folders, attachments and metadata be preserved during migration, not just conversion?
AYes. Folder hierarchy, attachments, and metadata including To, From, Cc, Bcc, Subject and Date are preserved whether the destination is a file format or a live mailbox.
QDoes it support Zoho Mail, Yahoo Mail, or other IMAP providers?
AYes. Any IMAP-enabled mailbox, including Zoho Mail, Yahoo Mail and most self-hosted mail servers, can be used as a migration destination.
QWhich Outlook versions are supported?
AOutlook 2007, 2010, 2013, 2016, 2019, 2021 and 365, covering both ANSI and Unicode PST formats.
QIs there licensing for teams or enterprise migration projects?
AYes. Multi-seat and volume licensing are available for IT departments running company-wide conversion or migration projects.
Whether the PST file just needs a new format or a whole new mailbox to live in, this tool reads what's inside it, healthy or corrupted, and gets it there, one file or an entire folder at a time.
Download the free trial, run it against the real file, and see exactly what comes out before deciding to buy.