MailtoPst
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Email PST

Convert Email to PST
Online Tool

Convert email files from any format (EML, MBOX, OLM, MSG, EMLX) to Outlook PST. Create PST files for import into Microsoft Outlook. Works online, no Outlook needed.

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🛡️ GDPR Compliant 🔒 TLS 1.3 Encryption 🇪🇺 Hosted in EU 🇫🇷 Built in France 🗑️ Auto-delete 24h

What is a Email file?

Email data comes in many formats depending on the email client or service you use. When you need to consolidate emails into a PST file for Microsoft Outlook, you might be working with:

- EML — individual email files from Thunderbird, Windows Mail, and many other clients
- MBOX — archive files from Thunderbird, Gmail Takeout, and Unix-based mail systems
- OLM — Outlook for Mac export archives
- MSG — individual Outlook message files
- EMLX — Apple Mail's email storage format
- OST — Outlook offline cache files

Each format represents the same underlying data — email messages with headers, body, and attachments — but stored in different ways. Converting to PST unifies them all into the format Microsoft Outlook understands natively.

What is a PST file?

PST (Personal Storage Table) is Microsoft Outlook's native data file format. It stores emails, calendar entries, contacts, tasks, and notes in a single binary file that Outlook can open, import, and manage directly.

PST files are essential for:
- Microsoft Outlook import — the standard way to bring external email data into Outlook
- Email backup and archiving — Outlook's built-in archive feature creates PST files
- Data migration to Exchange/Office 365 — the Microsoft Import Service accepts PST files
- Legal and compliance — many eDiscovery tools work with PST as a primary format
- Sharing email data — PST files can be shared and opened by any Outlook installation

By converting your emails to PST, you create a file that integrates seamlessly with Microsoft's email ecosystem, from desktop Outlook to Exchange Online and Office 365.

Why convert Email to PST?

Converting email files to PST format is valuable in many business and personal scenarios:

1. Migrating to Microsoft Outlook
Whether you are switching from Thunderbird, Apple Mail, or any other client to Outlook, creating a PST file is the most reliable way to import your email history.

2. Office 365 and Exchange migration
Microsoft's Import Service for Office 365 accepts PST files as the primary input format. Converting your emails to PST is the first step in a cloud migration to Microsoft 365.

3. Consolidating email archives
If you have emails scattered across multiple formats and clients, converting everything to PST creates a single, unified archive that Outlook can manage.

4. Legal discovery preparation
Many eDiscovery and litigation support tools are optimized for PST files. Converting email evidence to PST streamlines the legal review process.

5. Backup standardization
Organizations that standardize on Microsoft Outlook benefit from having all email backups in PST format, ensuring consistency and easy restoration.

Email vs PST — Key Differences

Feature Email PST
Compatibility Varies by source format Microsoft Outlook (all versions)
Data types Usually email only Email + calendar + contacts + tasks
Migration path Limited Direct import to Outlook/Office 365
eDiscovery support Varies Industry standard
File structure Varies (text, binary, etc.) Binary B-tree database
Outlook integration Requires conversion Native (open, import, mount)

3 methods to convert Email to PST

Method 1: Convert with MailtoPst (any format to PST)

Upload your email file (EML, MBOX, OLM, MSG, EMLX, or OST) to MailtoPst. Select PST as the output format. Download the resulting PST file and open it directly in Microsoft Outlook.

Pros

  • ✓ Supports all major email formats
  • ✓ Works from any browser, any OS
  • ✓ No Outlook needed for conversion
  • ✓ Preserves folder structure and metadata
  • ✓ GDPR compliant, EU servers

Cons

  • ✗ Requires internet connection
  • ✗ Paid after first conversion

Method 2: Import via Outlook then export as PST

If you have Outlook installed, import your emails through Outlook's built-in import wizard, then use File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst) to create a PST.

Pros

  • ✓ Free (uses existing Outlook)
  • ✓ Official Microsoft method
  • ✓ Handles various input formats

Cons

  • ✗ Requires Microsoft Outlook (Windows)
  • ✗ Multi-step manual process
  • ✗ Not all source formats supported natively
  • ✗ Time-consuming for large datasets
Recommended

Method 3: Thunderbird + ImportExportTools add-on

Import emails into Thunderbird from any supported format, then use the ImportExportTools NG add-on to export them as individual messages. Use MailtoPst to convert those to PST.

Pros

  • ✓ Free tools (Thunderbird is free)
  • ✓ Handles MBOX and EML natively
  • ✓ Cross-platform (Windows, Mac, Linux)

Cons

  • ✗ Multiple steps required
  • ✗ Still needs conversion for PST output
  • ✗ Time-consuming process
Try MailtoPst →

Step by step

How to convert Email to PST with MailtoPst

01

Upload your Email file

Drag & drop or click to upload your .email file. Files up to 51 GB supported with resumable upload.

02

Choose PST as output

Select PST from the format dropdown. MailtoPst auto-detects the best conversion settings.

03

Download your PST file

Conversion takes seconds. Download your .pst file or receive it by email.

Convert your Email to PST now →

100 MB free credit. No credit card required.

FAQ

Frequently Asked Questions

What email formats can I convert to PST?

MailtoPst converts EML, MBOX, OLM, MSG, EMLX, and OST files to PST format. This covers all major email clients including Thunderbird, Gmail Takeout, Apple Mail, Outlook for Mac, and Exchange cache files.

Do I need Outlook installed to create a PST file?

No. MailtoPst creates PST files server-side without any Microsoft software. You upload your source file from any browser, and download a ready-to-use PST that you can then open in Outlook on any machine.

Can I import the converted PST into Office 365?

Yes. PST files created by MailtoPst are compatible with the Microsoft 365 Import Service (Network Upload), Outlook desktop import, and third-party migration tools. It is the standard format for Office 365 email import.

Will the folder structure be preserved in the PST?

Yes. MailtoPst recreates your original folder hierarchy inside the PST file. When you open it in Outlook, all folders and subfolders appear exactly as they were in the source email client.

Is there a size limit for email to PST conversion?

MailtoPst supports source files up to 50 GB. The resulting PST file can be up to 50 GB as well, which is the maximum size Outlook supports. For very large conversions, the data may be split across multiple PST files.

Related conversions

EML → PST EMLX → PST MBOX → PST MSG → PST OLM → PST
See all 30 conversion paths →

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First conversion free. No credit card required.

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