EML to PST isn’t a one-click “convert” unless you use an EML converter tool. Manually, you import the EML files into Outlook first, then export that Outlook folder as a PST.
Use the right method based on what you have installed:
- New Outlook (Windows app): import EML into your mailbox (fast for small batches, has limits).
- Classic Outlook (desktop): drag/import EML → Export to PST (best free route).
- Thousands of EML / folder tree must be preserved: use an EML to PST converter tool (Outlook must be installed to create a PST).
Works for: EML from Thunderbird, Windows Mail, eM Client, Mailbird, Postbox, and more.
Convert Thunderbird EML to PST (same steps)
- Thunderbird can save messages as .eml.
- Follow Method 2 (import → export PST).
Tip: Export a folder at a time (Inbox, Sent, etc.) so you can recreate the same folder names in Outlook before importing.
Quick Answer: Pick the best method
- New Outlook: Settings → General → Import → Import .eml.
- Classic Outlook: import EML into a folder → File → Open & Export → Import/Export → Export to a file → PST.
- Many EML files / nested folders: use a converter tool (Outlook must be installed to create a PST).
Method chooser (fastest path)
| Your situation | Best method |
|---|---|
| New Outlook installed | Method 1 (Bulk import EML) |
| Classic Outlook installed | Method 2 (Import → Export PST) |
| No Outlook installed | Install Outlook first (required for PST), then use Method 2 or Method 3 |
| Need folder hierarchy preserved | Method 3 (Converter) |
Before you start (important limits)
Critical note: Classic Outlook vs New Outlook
Classic Outlook: Best-supported option for exporting PST files.
New Outlook: Can import EML into your mailbox, but PST features are limited. Switch to Classic Outlook if export options are missing.
- Work on copies: keep original EML files unchanged.
- Export to a local folder: avoid OneDrive-synced paths for PST output.
- New Outlook limits: only top-level .eml files import; subfolders are ignored, and each .eml must be under 14 MB.
- Import in smaller batches: large drag-and-drop batches can freeze Outlook.
Verify after import: open a few EMLs in Outlook and confirm attachments and dates.
Verify after export: open the PST and spot-check 10 messages.
Method 1: New Outlook (Import to Mailbox Only)
New Outlook imports EML into your mailbox (not into a PST file). It does not reliably create a downloadable PST. If you need a PST, use Method 2 or Method 3. This is the quickest path for small batches when you use New Outlook on Windows.
- Open New Outlook.
- Go to Settings → General → Import.
- Select Start import.
- Choose the folder that contains your .eml files.
- Select the destination account and folder, then start the import.
Important limits:
- Only top-level .eml files in the selected folder are imported (subfolders are ignored).
- Each .eml file must be 14 MB or smaller.
Need a PST file? Use Classic Outlook export (Method 2) after import if you must create a PST.
Method 2: Classic Outlook - Import EML, then Export PST
This is the best free method when you need a PST file.
Part A - Import EML into Outlook
- Open Classic Outlook and create a new folder (for example, “Imported EML”).
- Select a small batch of EML files in File Explorer.
- Drag and drop them into the Outlook folder.
- Repeat for other folders as needed.
Folder structure note: Drag-and-drop will not automatically recreate your Windows folder tree inside Outlook. Create matching folders first, or use the converter to preserve hierarchy.
Performance tip: If Outlook freezes, import in smaller batches and keep Outlook open for a few minutes after each drop.
Part B - Export that folder to PST
- Go to File → Open & Export → Import/Export.
- Select Export to a file and click Next.
- Choose Outlook Data File (.pst) and click Next.
- Select your imported folder and check Include subfolders.
- Choose a local save path and finish the export.
Note: This works in Classic Outlook; New Outlook behaves differently.
What Outlook export includes (and does not)
- Included (typically): Email + attachments, selected folders (when Include subfolders is checked).
- Not included: Rules, blocked/safe sender lists, view settings, folder properties, autocomplete cache.
What you will actually get in the PST
EML contains mail only, so PST output is primarily email and attachments.
| Method | Mail + attachments | Folder structure | Contacts/Calendar/Tasks |
|---|---|---|---|
| New Outlook bulk import | Yes | Limited | No |
| Classic Outlook import/export | Yes | Limited | No |
| Converter (direct EML) | Yes | Yes | No |
Method 3: Use an EML to PST Converter (Outlook must be installed)
SysCurve EML to PST Converter is the fastest option for large batches and preserved folder hierarchy. Important: To create a PST file, Microsoft Outlook must be installed on the same PC (Outlook does not need to be open during conversion, but it must be installed).
Requirements: Outlook installed and set up at least once (a mail profile exists).
Instant Solution - SysCurve EML to PST Converter
Convert EML to PST, MSG, MBOX, HTML, and other file formats.
- Download and install the SysCurve EML to PST Converter.
- Launch the tool and click Browse to select EML files or a folder.
- Preview the emails (optional).
- Select PST as the export format.
- Choose an output folder and start the export.
- Open the PST in Outlook to verify your data.
Manual Methods vs SysCurve Converter (Honest Comparison)
| Aspect | Manual methods | SysCurve EML to PST Converter |
|---|---|---|
| Cost | Free | Paid |
| Speed | Slow for large sets | Faster |
| Folder structure | Limited | Preserved |
| Risk of errors | Medium | Low |
| Privacy | Offline | Offline |
Other Helpful Features
- Convert EML to PST, MSG, MBOX, and HTML formats.
- Preview EML messages before export.
- Selective conversion by subject, date, or sender.
- Maintain folder hierarchy.
- Compatible with Windows.
Legacy methods (Windows Live Mail / Outlook Express) - not recommended
Windows Live Mail and Outlook Express are discontinued and not recommended in 2026. If you still use them on an older system, the safest approach is to import your EML into Classic Outlook and export to PST (Method 2) or use a converter (Method 3).
Troubleshooting (common problems + fixes)
- New Outlook did not import subfolders: it only imports top-level .eml files. Flatten folders first.
- New Outlook skipped files: check the 14 MB per .eml limit.
- Outlook freezes during drag and drop: import smaller batches and keep Outlook open a few minutes after each drop.
- Missing attachments: confirm the EML files open correctly before import.
- Wrong dates or encoding: import into a new Outlook profile and re-export.
- Duplicates: export to PST with “Do not import duplicates” or use a converter filter.
- PST export fails: export to a local folder, not OneDrive.
- Folder hierarchy is lost: manual drag and drop is limited. Use a converter for structure.
Frequently Asked Questions
Does New Outlook create PST files?
Not reliably. New Outlook focuses on mailbox import; use Classic Outlook to export a PST.
Can I merge multiple EML folders into one PST?
Yes. Import EML into a single Outlook folder structure and export that mailbox or root folder to PST.
How many EML files can Outlook import at once?
There is no fixed limit, but performance drops fast. Import in batches (around 200-500 per drag) to avoid freezes.
Can I convert EML to PST manually?
Yes. New Outlook can bulk import EML for small batches, and Classic Outlook can export a PST after import.
Do I need Outlook installed for manual conversion?
Yes. Manual methods require Outlook to import and export a PST file.
Will attachments be preserved?
Yes, attachments are preserved when EML files are imported correctly.
Can I convert EML to PST without installing Outlook?
To create a PST file, Outlook must be installed on the PC. If you do not want a PST and only want emails inside Outlook, New Outlook can bulk import EML for small batches (with limits).
Is there a free EML to PST converter?
There are free methods and some free utilities, but free options usually have limits on batch size, folder structure, or speed.
Is it safe to convert EML to PST online?
For sensitive data, prefer offline tools and avoid uploads.
Final word
If you already use New Outlook, bulk import EML for small batches. If you need a PST file, Classic Outlook export is the most reliable free route. For large EML archives or preserved folder trees, a converter is faster and more dependable.
