Open PST File Without Outlook — Every Method (Windows, Mac, Linux)

What You Need to Know Before Opening a PST File

A PST (Personal Storage Table) file is a binary data file created by Microsoft Outlook to store emails, calendar events, contacts, tasks, and notes. It is one of the most common email archive formats — you may encounter one when receiving an email backup, inheriting a colleague’s mailbox, or recovering data from an old computer.

The challenge: PST files are a proprietary Microsoft format. Native support outside of Outlook is limited. But several practical methods exist to read, search, and extract data from PST files on any operating system — without purchasing or installing Microsoft Outlook.

Before you proceed, check your PST file size. Files under 20 GB process smoothly with any method. Files over 20 GB may need special handling, covered in the troubleshooting section at the end.

For a full overview of the format itself, see What Is a PST File.

Method 1: Open PST Online With MailtoPst (No Install)

The fastest way to open a PST file without Outlook is an online viewer. MailtoPst lets you upload a PST file directly in your browser and access its contents — no software, no Outlook license.

How It Works

1. Go to mailtopst.com and upload your PST file.
2. The service parses the PST structure server-side and presents the folder hierarchy.
3. Browse folders, read individual emails, and view attachment lists.
4. If needed, convert to another format (MBOX, EML) for use in your preferred email client.

This method requires no installation, works on any OS with a modern browser, and handles the complex binary parsing entirely on the server. MailtoPst provides 100 MB free credit — enough to preview a small to medium PST file or test the conversion process.

Best for: Quick one-time access on any platform.

Method 2: Open With Microsoft Outlook on Windows

If you have Outlook installed on Windows, this is the most direct method and gives you full read/write access.

Go to File > Open & Export > Open Outlook Data File, browse to the PST file, and select it. The file appears as a new top-level folder in the folder pane alongside your existing mailbox. You can browse folders, read emails, open attachments, and view contacts and calendar items.

To close the PST when finished, right-click its top-level folder and select Close — this detaches the file without deleting it.

If Outlook asks for a password, the PST was created with password protection. You need the original password; there is no built-in recovery in Outlook.

Best for: Windows users who already have Outlook and need ongoing full access.

Method 3: Open With Outlook for Mac

Outlook for Mac can import PST files, though the process differs from Windows and has some limitations.

Go to File > Import, select “Outlook for Windows archive file (.pst)”, and follow the import wizard. Unlike Windows Outlook, the Mac version imports the PST content into your current profile rather than opening it as a separate data file.

Calendar events and tasks may not import completely in all cases, particularly recurring events with complex rules. After import, verify your calendar entries transferred correctly.

For a detailed walkthrough, see How to Open a PST File on Mac.

Best for: Mac users who already have Outlook for Mac.

Method 4: Convert PST to MBOX for Thunderbird or Apple Mail

If you want ongoing access to PST emails in Thunderbird or Apple Mail, converting to MBOX is the most practical path.

Use the PST to MBOX converter to transform your file. The converter maps PST folders to individual MBOX files, preserving the folder hierarchy, message metadata, and attachments. Then:

• Thunderbird: Import using the ImportExportTools NG add-on
• Apple Mail (macOS): Use File > Import Mailboxes > Files in mbox format

The MBOX format is an open standard that will remain readable indefinitely — ideal for long-term archiving. See How to Convert PST to MBOX Without Outlook for step-by-step instructions.

Best for: Users migrating to Thunderbird or Apple Mail as their primary client.

Method 5: Convert PST to EML for Individual Messages

When you only need specific emails rather than a full mailbox, converting to EML files gives you the most granular access.

Use the PST to EML converter to extract individual messages. Each EML file contains one email with all headers, body, and attachments. EML files can be opened with:

• Windows Mail app (double-click)
• Apple Mail on macOS
• Thunderbird on any platform
• Any text editor (plain text based)

EML files are also easy to share, attach to tickets, or load into document management and eDiscovery platforms.

Best for: Extracting specific emails, compliance workflows, and eDiscovery.

Opening PST Files on Windows Without Outlook

Windows users have additional options beyond the methods above.

SysTools PST Viewer

Free Windows tool that opens PST files without Outlook. Renders emails with formatting, shows folder structure, and lets you view attachments. The free version is read-only, sufficient for browsing archived emails.

Kernel PST Viewer

Another free Windows tool with a familiar three-pane layout (folder tree, message list, reading pane). Supports both ANSI and Unicode PST files.

Command-Line: readpst via WSL

For technical users, the open-source readpst utility (part of the libpst package) can extract PST contents from the command line. Windows users can run it through WSL:

sudo apt install pst-utils
readpst -o output_folder/ your_file.pst

This extracts all emails into MBOX or individual files. See readpst as a MailtoPst alternative for a detailed comparison.

Opening PST Files on Mac

macOS has no native PST support. If you do not have Outlook for Mac:

Online Conversion (Recommended)

Upload the PST to MailtoPst and convert to MBOX. Then import the MBOX into Apple Mail: File > Import Mailboxes > Files in mbox format. The entire workflow requires only a browser and Apple Mail — both come pre-installed on every Mac.

Thunderbird

Install Thunderbird for macOS and use the PST-to-MBOX conversion approach above. Thunderbird handles MBOX natively and is a solid permanent solution for frequent work with email archives.

readpst on macOS

Install via Homebrew:

brew install libpst
readpst -o output_folder/ your_file.pst

Runs locally on your machine — no data upload needed, which matters for sensitive archives.

Opening PST Files on Linux

Linux users benefit from strong command-line support.

readpst (libpst)

The standard Linux tool. Install via your package manager:

# Debian/Ubuntu
sudo apt install pst-utils

# Fedora/RHEL
sudo dnf install libpst

# Arch Linux
sudo pacman -S libpst

Common usage:

# Extract to MBOX
readpst -o output_folder/ your_file.pst

# Extract to individual EML files
readpst -e -o output_folder/ your_file.pst

# Preserve folder structure
readpst -r -o output_folder/ your_file.pst

Evolution

GNOME’s Evolution email client can import PST files via the evolution-pst-import plugin. Go to File > Import and select your PST file.

Which Method Should You Choose

Scenario	Recommended method	Platform
Quick access, no install	Online with MailtoPst	Any
Full mailbox access, ongoing use	Open in Outlook	Windows
One-time import into existing account	Import in Outlook for Mac	macOS
Migrate to Thunderbird or Apple Mail	Convert to MBOX	Any
Extract specific emails	Convert to EML	Any
Linux workstation	readpst or online	Linux
Share individual emails	Convert to EML	Any
Compliance / eDiscovery	Convert to EML	Any

For most users who receive a one-off PST file and need to read its contents, the online method offers the fastest path with no installation required.

For Legal and Compliance Teams

PST files frequently appear in eDiscovery, regulatory compliance, and internal investigations. Converting PST to EML produces individual message files loadable into most eDiscovery platforms (Relativity, Nuix, Concordance). Each EML file retains full metadata for chronological sorting, keyword search, and deduplication.

For more on email review in legal contexts, see our eDiscovery use case.

Troubleshooting PST Files That Won’t Open

File Is Too Large

Outlook has performance limits with large PST files. If your file exceeds 20 GB, Outlook may be slow or fail entirely. Convert to MBOX or EML to bypass Outlook’s size limitations.

File Is Corrupted

Use Microsoft’s Inbox Repair Tool (ScanPST.exe), located in the Outlook installation directory. Run ScanPST, point it at the damaged file, and let it attempt repairs. Multiple passes may be necessary. MailtoPst can also recover data from many corrupted PST files — our engine attempts to extract all readable email items even if parts of the file are damaged.

Password Protected

PST files with password protection require the original password. Outlook provides no recovery mechanism. For business environments, check with your IT department.

Wrong Outlook Version

Very old PST files in ANSI format (pre-Outlook 2003) have a 2 GB size limit. Converting to MBOX or EML resolves compatibility issues entirely.

Open Your PST File Now

You do not need Microsoft Outlook to access PST files. For the quickest path with no installation, upload your PST to MailtoPst — convert to MBOX or EML, or preview the contents online.

100 MB free credit. No credit card required. Results in seconds.

Convert now →