MailtoPst
FR Try Free
MSG PST

Convert MSG to PST
Free Online Tool

Merge individual Outlook MSG files into a single PST archive. Batch convert hundreds of .msg files. EU servers, GDPR compliant.

Convert now — free → See how it works
🛡️ GDPR Compliant 🔒 TLS 1.3 Encryption 🇪🇺 EU Servers 🗑️ Auto-delete 48h

What is a MSG file?

MSG is Microsoft Outlook's proprietary format for storing individual email messages. When you drag an email from Outlook to your desktop, or use 'Save As', it creates a .msg file containing the message, attachments, and all Outlook-specific properties.

MSG files are used for:
- Saving individual Outlook emails — drag & drop or File > Save As in Outlook
- Email forwarding as attachment — Outlook attaches emails as .msg files
- Legal evidence — preserves all original metadata including internal routing headers
- CRM and document management — many systems store email records as .msg files

MSG is a binary OLE (Object Linking and Embedding) format, making it:
- Compact and preserves all Outlook properties (flags, categories, voting buttons)
- Only fully readable in Microsoft Outlook
- Not compatible with non-Microsoft email clients like Thunderbird or Apple Mail

What is a PST file?

PST (Personal Storage Table) is Microsoft Outlook's archive format that can store thousands of emails, calendar items, and contacts in a single organized file. Unlike individual MSG files scattered across your filesystem, a PST provides a structured, searchable email archive.

Converting MSG files to PST gives you:
- Single-file organization — instead of thousands of .msg files, one .PST
- Folder hierarchy — organize emails into folders within the PST
- Full Outlook integration — mount the PST as a mailbox in Outlook
- Search capability — Outlook indexes PST content for instant search

Why convert MSG to PST?

Converting MSG to PST is essential for organizing and archiving Outlook emails:

1. Consolidating saved emails
Over years of use, you may accumulate thousands of .msg files saved to folders, shared drives, or document management systems. Converting to PST consolidates them into a single, manageable archive.

2. Email archiving for compliance
Organizations that save email evidence or correspondence as .msg files need to create searchable PST archives for auditing, legal holds, or regulatory compliance.

3. Restoring a mailbox
If you have a folder of .msg backups from a previous mailbox, converting to PST lets you import them back into Outlook as a complete mailbox structure.

4. Sharing email collections
Sharing hundreds of .msg files is impractical. A single PST file is much easier to transfer, store, and open.

MSG vs PST — Key Differences

Feature MSG PST
File structure One file per email (OLE binary) Single database for all emails
Organization Files scattered in filesystem Internal folder hierarchy
Typical use Individual email preservation Mailbox archive / bulk storage
Email clients Microsoft Outlook only Microsoft Outlook (all versions)
Batch management Difficult with many files Single file, easy to manage
Search Windows file search only Native Outlook search
File size KB to MB per email Up to 50 GB per PST
Sharing Send individual files Share single archive

3 methods to convert MSG to PST

Method 1: Import manually into Outlook

Open each MSG file in Outlook, then move or copy it to a PST data file. This is free but extremely tedious for more than a few files.

Pros

  • ✓ Free
  • ✓ Uses only Outlook

Cons

  • ✗ Extremely slow (one file at a time)
  • ✗ Manual drag & drop for each email
  • ✗ No batch processing
  • ✗ Error-prone for large quantities

Method 2: Desktop conversion tool

Several desktop tools can batch-process MSG files into PST on Windows. These paid applications typically cost between $29 and $99 per license.

Pros

  • ✓ Batch processing
  • ✓ Folder mapping options

Cons

  • ✗ Paid software ($29-$99)
  • ✗ Windows only
  • ✗ Installation required
Recommended

Method 3: MailtoPst (online, free trial)

Upload a ZIP of your MSG files to MailtoPst, choose PST as the output, and download. Preserves all Outlook properties, categories, and flags.

Pros

  • ✓ First conversion free
  • ✓ Batch processing (ZIP upload)
  • ✓ Preserves Outlook properties
  • ✓ Works on any OS
  • ✓ GDPR compliant, EU servers

Cons

  • ✗ Requires internet connection
  • ✗ Paid after first conversion
Try MailtoPst free →

Step by step

How to convert MSG to PST with MailtoPst

01

Upload your MSG file

Drag & drop or click to upload your .msg 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 MSG to PST now →

First conversion free. No credit card required.

FAQ

Frequently Asked Questions

Can I merge hundreds of MSG files into one PST?

Yes. ZIP all your .msg files together, upload to MailtoPst, and we'll merge them into a single organized PST file. Directory structure in the ZIP becomes folder hierarchy in the PST.

Are Outlook categories and flags preserved?

Yes. MSG files contain Outlook-specific metadata (categories, flags, importance, follow-up dates). MailtoPst preserves all of these in the converted PST.

Can I convert MSG files without Outlook installed?

Yes. MailtoPst is an online tool — it reads MSG files server-side. You don't need Outlook or Windows to convert.

What if some MSG files are corrupt?

MailtoPst attempts to extract data from all files in the batch. If some MSG files are unreadable, the conversion continues with the readable ones, and you're notified about any failures.

Is MSG to PST conversion free?

Your first conversion is free with no credit card required. Credit packs start from €4.99 for 5 conversions.

Related conversions

EML → PST MBOX → PST OLM → PST OST → PST
See all 30 conversion paths →

Ready to convert your emails?

First conversion free. No credit card required.

Start converting → See pricing