Convert EML to PST — Import EML Emails into Outlook

• Creates valid PST files without requiring Outlook on the conversion machine
• Loads EML files from any folder — drag and drop, browse, or specify a path
• Preserves sender, recipient, subject, date, body, and all attachments
• Processes thousands of EML files in a single batch session
• Merges multiple EML files into one PST or saves each separately
• Includes a 30-day free trial with no credit card or email required

Download Total Mail Converter and start importing your EML emails into Outlook today.

EML vs PST: What Is the Difference?

EML is a plain-text file format defined by RFC 5322. Each .eml file holds exactly one email message — headers, body, and MIME-encoded attachments. The format is human-readable: open any .eml in a text editor, and you see From, To, Subject, and Date lines followed by the message content. Thunderbird, Windows Mail, Windows Live Mail, eM Client, and dozens of other email programs use EML as their native or export format.

PST (Personal Storage Table) is a proprietary binary database used by Microsoft Outlook. A single PST file stores emails, contacts, calendar events, and tasks in a structured folder hierarchy. Outlook 2007 through 2024 use the Unicode PST format, supporting files up to 50 GB.

Outlook cannot import .eml files in bulk. You can drag one or two into a folder, but converting hundreds or thousands of EML files this way is impractical — you lose folder structure, metadata may change, and attachments sometimes detach. A dedicated converter reads the EML files, builds a proper PST structure, and produces a file Outlook imports cleanly.

How to Convert EML to PST

• Step 1. Launch Total Mail Converter. Click Add files to select individual EML files, or click Add folder to load every .eml file in a directory.
• Step 2. Select the emails you want to convert. Use Check All to process everything in the list, or check specific messages.
• Step 3. Click the PST button in the format toolbar at the top of the window.
• Step 4. Choose a destination path for the output PST file.
• Step 5. Configure settings: select which fields to include (From, To, CC, Date, Subject, Body), choose to merge all emails into one PST or create separate files.
• Step 6. Press Start. The converter creates a PST file ready for Outlook import.

When conversion finishes, open Outlook and go to File → Open & Export → Import/Export. Select "Import from another program or file," pick the PST, and map it to the folder where you want the messages. Your emails appear with their original metadata intact.

Command-Line Conversion

Total Mail Converter includes a command-line interface for scripted and automated conversions. Example:

MailConverter.exe "C:\Emails\*.eml" -sPST "C:\Output\archive.pst"

Use this in .bat scripts to schedule nightly EML-to-PST exports, process incoming mail drops, or convert archives across multiple folders unattended.

Why Use Total Mail Converter?

Batch processing. Point the converter at a folder with thousands of .eml files and convert them all in one session. No manual selection, no drag-and-drop limits.

No Outlook required. The program generates valid PST files using its own built-in engine. Run the conversion on any Windows PC, then transfer the PST to the machine with Outlook.

Attachment preservation. All attachments — documents, images, ZIP archives — are stored inside the PST exactly as they were in the original EML files. No re-encoding or data loss.

Folder structure. Organize output by source folder, merge everything into a single PST, or create one PST per EML. You control how the archive is structured.

Flexible file selection. Add files individually, scan entire directories, or use wildcard patterns on the command line. Drag and drop works too.

Multiple output formats. Besides PST, Total Mail Converter exports EML to PDF, DOC, HTML, TIFF, TXT, and MSG from the same interface.

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Total Mail Converter Customer Reviews 2026

"We decommissioned a legacy mail system that left us with 60,000 EML files spread across department folders. Total Mail Converter processed the entire batch in under 20 minutes and produced clean PST files that imported into Outlook 365 without a single error. Folder structure and attachments came through intact. Saved us days of manual work."

Robert Hargrove IT Administrator, Kelton & Associates

"We received a production of 14,000 EML files for an e-discovery case. The review platform required PST input. Total Mail Converter merged everything into one PST with all metadata preserved — dates, senders, CC fields, attachments. The legal team loaded it into Relativity the same afternoon. Reliable tool for compliance work."

Sandra Whitfield Litigation Support Specialist

"I had years of personal email exported as .eml from Thunderbird and needed to consolidate them into Outlook. The converter picked up every file from my backup folders and merged them into a single PST. Fast and straightforward. My only wish is a progress estimate for large batches — the progress bar shows percentage but not remaining time."

James Petrov Software Developer

EML to PST Conversion: FAQ ▼