Every Byte Matters.
DT Outlook PST Migrator
Move PST Emails Directly Into a Live Mailbox
DT PST Migrator connects a PST file directly to Office 365, Google Workspace, Exchange Server, Zoho Mail or any IMAP server, and pushes every email, folder and attachment straight into the destination mailbox. No intermediate file, no manual import step, no size limit on the source PST.
Quick Summary:DT PST Migrator connects PST files directly to Office 365, Google Workspace, Exchange, Zoho, or any IMAP server. It migrates emails, attachments, and folder structures in bulk without intermediate output files, size limits, or Outlook installation.
Key Features of DT PST Migrator
Five destination types
Office 365, Google Workspace/Gmail, Exchange Server, Zoho Mail, and any standard IMAP server
No intermediate file
PST data goes straight into the destination mailbox, nothing exported to disk in between
No size limit on the source PST
tested on files over 100GB, multi-threaded engine handles terabyte-scale migrations
CSV bulk user mapping
match hundreds of PST files to the correct destination mailbox in one import, no manual matching
Admin impersonation support
migrate into user mailboxes with global admin credentials, no individual passwords required
Delta sync duplicate detection
re-running a migration only pushes emails that are not already in the destination
Folder exclusion filters
skip Junk, Deleted Items or any folder that should not be migrated
Bandwidth throttling
control how much network the migration uses during business hours
Auto-resume on disconnect
a dropped connection resumes exactly where it stopped, no duplicates created
Full audit report
every email migrated, skipped or flagged, logged with a timestamp and exportable as CSV
Converting a File Is Not the Same as Migrating One
A common point of confusion before choosing a tool: converting a PST file and migrating a PST file solve two different problems.
Converting a PST file produces a new file, in MBOX, PDF, EML or another format, sitting on the same computer. Getting that file's contents into an actual working mailbox still requires a separate import step afterward, whatever the destination email client's own import process happens to be.
Migrating a PST file skips that entire intermediate step. DT PST Migrator connects directly to the destination mailbox, Office 365, Gmail, Exchange, Zoho or IMAP, and pushes the emails straight in. There is no output file to manage, no separate import to run, and no gap between "PST processed" and "email actually usable" in the new mailbox. If the goal is to see the emails show up in a live inbox and nothing else, migration is the tool for that job, not conversion.
Five Cloud and Server Destinations, One Migration Engine
Office 365 and Microsoft 365
The most common destination. Individual mailbox migrations or bulk migration across hundreds of accounts, with CSV user mapping and admin impersonation for organization-wide moves.
Google Workspace and Gmail
PST emails land directly in Gmail with folder structure preserved and every attachment intact, connected through Google's own OAuth 2.0 authorization.
Exchange Server
On-premise or hosted Exchange environments. Impersonation support migrates data into user mailboxes without requiring each person's individual password.
Zoho Mail
A direct, IMAP-based push migration with full folder structure and complete metadata carried over.
Any IMAP Server
Hostinger, Namecheap, cPanel-hosted mail, or any provider that supports standard IMAP. If it accepts an IMAP connection, DT PST Migrator can push data into it.
Why PST Files Sitting on Local Machines Are a Real Liability
A PST file was a reasonable way to store a mailbox when everyone worked from the same desk with the same laptop every day. That assumption stopped holding a long time ago, and the risk it created never went away on its own.
A PST file living on one person's laptop means the emails disappear the moment that laptop fails. If the person leaves the company, IT has to recover the file manually before the data is usable to anyone else, if it can be recovered at all. If an auditor or legal team requests specific emails, nobody has a fast way to search across dozens of scattered PST files sitting on different machines. If the file grows past a certain size, Outlook itself starts throwing errors on the very file meant to preserve the record.
Migrating that data into Office 365 or Google Workspace solves all of this in one move. Emails become searchable, covered by the organization's existing backup and retention policies, and accessible from any device rather than tied to one physical laptop. DT PST Migrator handles the part that makes this practical at scale: getting the data in cleanly, completely, and with a full record of exactly what moved.
What Microsoft's Own Free Import Method Does Not Cover
Microsoft does provide a native way to get PST files into Office 365, network upload through the compliance center, and it is worth understanding what that method actually requires before assuming it covers every situation.
The native network upload path caps each individual PST file at 20GB, requires generating CSV mapping files and using Azure AzCopy manually, and depends on navigating the Microsoft 365 compliance center correctly for every batch. For a handful of small, healthy PST files, this free path can work. It becomes considerably harder to manage once PST files exceed that size, once dozens or hundreds of mailboxes need mapping at once, or once a migration needs to run without deep familiarity with Azure tooling.
DT PST Migrator removes the size ceiling entirely, replaces the manual AzCopy and compliance center steps with a single guided workflow, and adds CSV mapping, admin impersonation and delta sync duplicate detection on top, capabilities the native free method does not include at all.
Migrating a PST File in 5 Steps
Step 1: Install on a Windows Machine
Download and install. Works on Windows 10, 11 and Windows Server. No Outlook installation required at any point.
Step 2: Add the PST Files
Load a single PST file, or an entire folder of PST files for batch migration. No file size limit, tested on files over 100GB.
Step 3: Connect to the Destination
Sign in to Office 365, Google Workspace, Exchange or an IMAP server through secure OAuth 2.0. Login credentials are never stored by the tool.
Step 4: Map Users for Bulk Migrations
For multi-user migrations, import a CSV file mapping each PST to its correct destination mailbox, no manual matching per account.
Step 5: Migrate and Monitor
Start the migration and watch live progress. If the connection drops, it pauses and resumes automatically from exactly where it stopped. A full audit report is available once the migration finishes.
Your Machine to Your Mailbox, Nothing in Between
DT PST Migrator creates a direct, encrypted connection between the local PST file and the destination mailbox. Data never routes through Data TB's own servers, not for authentication, not for processing, and not for logging.
Authentication runs through OAuth 2.0, the same token-based standard used by major financial institutions. No password is stored anywhere in the process, and no session data is logged on Data TB's end. The migration path is two points: the machine running the tool, and the destination mailbox. Nothing sits in between.
OAuth 2.0 authentication.
Modern, token-based login, with no password stored anywhere.
Zero server touch.
Email content never routes through Data TB infrastructure at any point.
Auto-resume on disconnect.
A dropped connection resumes exactly where it stopped, without creating duplicate entries.
Full audit report.
Every email migrated, skipped or flagged, logged with a timestamp and exportable as CSV for compliance records.
The Migrations That Break Other Tools
Migrating 500 users in one project.
Bulk migration with CSV user mapping loads every PST file, matches each to the correct mailbox, and runs the entire batch in one session, with a full audit log available the next morning.
A PST file over 100GB.
No size limit is enforced. The multi-threaded push engine handles terabyte-scale migrations without crashing or throttling itself.
Running the same migration twice without creating duplicates.
Delta sync checks what already exists in the destination mailbox before pushing anything, so re-running a migration only adds what is genuinely new.
Needing to skip specific folders.
Junk, Deleted Items, or any folder that should not be carried over can be excluded before the migration starts.
Running a migration during business hours without saturating the network.
Built-in bandwidth throttling controls exactly how much of the connection the migration is allowed to use.
Not having individual user passwords for a bulk job.
Impersonation with global admin credentials migrates directly into user mailboxes for Office 365 and Exchange, without needing each person's login.
Who Actually Runs a PST Migration
Individuals switching to Gmail or Outlook.com.
Years of Outlook email land directly in the new inbox, folders, attachments and structure intact, without a manual import step.
Small businesses moving to Office 365.
Every laptop in the company likely has its own PST file. Batch migrate all of them into the correct mailboxes in one session, without touching each machine individually.
IT administrators handling a company-wide migration.
Hundreds of PST files, hundreds of users, a deadline. CSV mapping, impersonation, auto-resume and a full audit log cover exactly this scenario.
MSPs onboarding a new client.
A client's five-year PST archive moves directly into their new Google Workspace or Office 365 accounts, complete and with nothing left behind on the old machine.
Legal and compliance teams.
Archived PST files get ingested into Office 365 so they fall under existing eDiscovery and retention policies automatically, with a complete record of what was moved and when.
DT PST Migrator: Demo vs Full Version
| Feature | Demo Version | Full Version |
|---|---|---|
| Add PST files for processing | Included | Included |
| Preserve folder structure | Included | Included |
| Display count of emails and items | Included | Included |
| ANSI and Unicode PST compatibility | Included | Included |
| Windows 11 and earlier support | Included | Included |
| Migrate PST emails to cloud | Up to 40 emails per folder | No limit |
| Price | Free | Paid |
The demo runs the full migration workflow exactly as the full version does, connection, mapping, and monitoring all work identically. The only limit is how many emails per folder actually get pushed to the destination. The full version removes that limit entirely.
Start From 1 Month, No Yearly Lock-In
A migration project has a deadline, not an ongoing subscription need. DT PST Migrator starts at 1 month. Finish the migration, then extend only if there is a genuine reason to. Every plan includes the complete feature set, bulk migration, delta sync, impersonation, audit reports and auto-resume, with nothing held back at any tier.
For a single migration project with a clear end date.
Save 15 percent, for migrations spanning multiple phases.
For ongoing migration work through the year.
The best per-month value for sustained migration needs.
A 30-day money-back guarantee applies to every plan. If a migration does not complete cleanly, a full refund is available.
Need Both Conversion and Migration? The PST Suite Covers It
DT PST Migrator pushes PST data directly into a live mailbox. A separate tool, DT PST Converter, turns a PST file into MBOX, PDF, EML, MSG, CSV or VCF when a standalone file is what is actually needed instead of a live mailbox. The DT PST Suite bundles both tools under one license at a better combined price than buying them separately.
Frequently Asked Questions
QDo I need Microsoft Outlook installed to use this?
No. DT PST Migrator reads PST files through its own built-in engine, completely independent of Outlook.
QDo I need admin credentials for Office 365?
For a single-user migration, personal account credentials are enough. For bulk migration into multiple mailboxes, global admin access is needed to use impersonation, which allows the tool to migrate into user mailboxes without their individual passwords.
QWhat happens if my internet drops mid-migration?
Nothing is lost. Auto-resume picks up exactly where the migration stopped, with no duplicate emails created and no items skipped.
QWill emails already in the destination mailbox get duplicated?
No. Delta sync checks what already exists in the destination before pushing anything, so only emails that are not already there get migrated.
QCan I migrate multiple PST files to different users at once?
Yes. CSV bulk mapping lists each PST file and its corresponding mailbox, and the tool processes the entire batch in one session after the file is imported.
QCan I exclude certain folders from a migration?
Yes. The folder structure can be previewed before migration starts, and anything unwanted, such as Junk or Deleted Items, can be deselected.
QIs there a size limit on the PST file being migrated?
None. The tool is tested on PST files over 100GB, and terabyte-scale migrations complete without issue.
QHow is this different from Microsoft's own PST import method?
Microsoft's native network upload path caps individual PST files at 20GB and requires manual CSV mapping and Azure AzCopy configuration through the compliance center. DT PST Migrator removes that size limit and replaces the manual setup with a single guided workflow, while adding delta sync and admin impersonation on top.
QDoes my email data pass through Data TB's servers?
Never. The migration runs as a direct connection from the local machine to the destination mailbox. No email content is received, routed or seen by Data TB at any point.
QIs this the same as converting my PST file to another format?
No. DT PST Migrator pushes PST data directly into a live mailbox with no file produced in between. Converting a PST file into a standalone file such as MBOX, PDF or EML is handled by a separate tool, DT PST Converter.
System Requirements
| Specification | Detail |
|---|---|
| Software Version | 25.7.4 |
| Software Size | 33 MB |
| Operating System | Windows 11, 10, Server 2022/2019/2016 |
| Outlook Required | No, completely independent |
| Authentication | OAuth 2.0 (Modern) and Basic Auth |
| PST Types Supported | ANSI and Unicode, Outlook 2007 to 365 |
| RAM | 8 GB recommended for bulk migrations |
| File Size Limit | None, tested on 100GB+ PST files |
| Network Control | Built-in bandwidth throttling |
Your PST Archive Belongs in the Cloud
Every day a PST file sits on a local machine, it is one hardware failure away from being gone entirely. DT PST Migrator moves it directly into a live mailbox, backed up, searchable, accessible from anywhere, and covered by existing retention policies. Run the free trial against a real migration and see exactly what lands in the destination before deciding to buy.
