How To Open An .MSG File | Read Emails Without Headaches

You’ve got an .msg attachment sitting on your desktop, you double-click, and Windows shrugs. Maybe it launches the wrong app. Maybe nothing happens.

This post gives you dependable ways to open an MSG file on Windows and Mac, plus fallbacks when Outlook isn’t installed. You’ll get steps, what to expect with attachments, and a troubleshooting checklist for the usual failure points.

What An MSG File Contains

An MSG file is a single Outlook “item” stored as a file. That item might be an email message, meeting request, task, contact, or another Outlook object. It’s not a plain-text email like .eml, and it’s not a mailbox archive like .pst. It’s one item, wrapped in a structure Outlook understands.

That packaging is why many apps can’t open it directly. If you can open MSG in Outlook, you can usually read the message and save attachments. If you can’t, converting to a more common format is often enough to read the content, even if a few Outlook-only fields don’t carry over.

Before you start clicking attachments, treat MSG like any other file that arrived through email or chat. A message file can carry links and attachments you didn’t ask for. A quick scan and a cautious open are worth the two seconds.

Opening An MSG File On Windows With Fewer Clicks

On Windows, the smoothest path is Outlook. If Outlook is installed, open MSG by double-clicking the file, right-clicking and choosing Open with, or dragging the file into Outlook. If the file launches something else, fix the default app setting so Windows routes .msg to Outlook each time.

Open MSG In Outlook Classic

Double-click the file in the Windows file manager. If Outlook is already running, you can drag the MSG into your Outlook window.

After it opens, do two things right away:

1. Confirm what the item is. A meeting request looks different from a normal email.
2. Save attachments to a folder you control before opening them.

If you want the message to stay searchable, move it into a mailbox folder instead of leaving it as a loose file. You can drag the open message into a folder in Outlook, or drag the .msg file into a folder list on the left.

Open MSG In The New Outlook App

Microsoft documents direct opening for MSG files in the new Outlook app. Try a double-click in the Windows file manager, right-click and pick Outlook as the app, or drag-and-drop onto the reading area. Open .eml, .msg, and .oft files in new Outlook lists the methods Microsoft recommends.

If your build of Outlook doesn’t react the same way, don’t assume the file is broken. Many “won’t open” cases come down to default app settings, or a file that still points at an older mail app.

Set Outlook As The Default App For .MSG

Set Outlook as the default handler for .msg so double-click works the same way across folders. Use Windows Settings, search for default apps, then choose defaults by file type and set .msg to Outlook. Microsoft’s steps are here: Change default apps in Windows.

After you switch the default, close Outlook if it’s running, then open the MSG again.

Open MSG Files That Came From A Zip Or Download

If the MSG arrived inside a ZIP file, extract it first, then open the extracted MSG. Some apps try to open a file directly from the ZIP view, and that can break drag-and-drop into Outlook.

If the MSG came from the internet, Windows may mark it as downloaded. When that happens, right-click the file, open Properties, and check for an Unblock option. This step is shown again in the troubleshooting table later, since it’s a common reason an MSG file feels “dead” while Outlook is installed.

What To Do When Attachments Don’t Open

MSG is the container. Attachments still depend on their own file types. Separate the problems like this:

1. Open the message in Outlook.
2. Save one attachment to a known folder.
3. Open the saved file from that folder.

If the attachment opens from disk, Outlook is fine. If it won’t open from disk either, focus on that attachment’s viewer or file association.

If you’re reviewing a message for work, avoid opening attachments straight from Outlook’s preview bar. Save first, scan, then open. That keeps your antivirus history and file provenance clearer, and it reduces surprises from temporary folders.

Choosing The Right Approach By Situation

Use this table to pick a path that matches what you have installed and what you need out of the message.

Situation	Best Way To Open	What You Get
Outlook installed on Windows	Double-click in the Windows file manager	Full message view plus attachment access
New Outlook installed	Open via the Windows file manager or drag into reading area	Message view; behavior depends on build
Wrong app opens the file	Set .msg default app to Outlook	Stable double-click behavior
No Outlook, need to read right away	Ask for EML or PDF resend	Readable message with fewer Outlook-only fields
No Outlook, need attachments	Use a converter to extract attachments	Attachments saved as regular files
Mac user with Microsoft 365	Open in Outlook for Mac if available	Message view; varies by version
Need long-term record	Store the message in a mailbox folder	Searchable mailbox item
Suspect the file is malicious	Scan the file, then open in a restricted account	Reduced risk while you review content

Open MSG On Mac And Mobile

Mac handling depends on whether you use Outlook for Mac. If you do, try dragging the MSG file into Outlook. If it opens, save attachments to a local folder before you start forwarding items around.

If you don’t use Outlook on Mac, convert the MSG file to EML or PDF on a Windows machine, then open the converted file on Mac. EML is widely readable in mail apps. PDF works well when you only need a fixed view.

Phones and tablets rarely open MSG directly. The same conversion idea applies: PDF for reading, extracted attachments as separate files for opening.

Safe Workarounds When Outlook Isn’t Installed

If you don’t have Outlook, choose a fallback based on what you need: reading only, or reading plus attachments.

Ask For A Resend In EML Or PDF

Ask the sender to forward the original email as an attachment in EML, or print to PDF and send that. When attachments matter, ask them to include the originals too, not just the PDF.

If you need headers for troubleshooting, ask the sender to include full headers in the forwarded message body, or send a screenshot of the header view. Converting MSG to PDF can hide some header fields, so it’s better to request them directly when you’re chasing an SMTP or spam-filter issue.

Convert MSG To EML Or PDF Locally

Conversion tools range from simple viewers to export utilities. If you go this route, scan the file first and prefer tools that can run offline. Many converters let you preview the message, save attachments, and export to EML or PDF for sharing.

Be cautious with web upload converters, especially for sensitive emails. Keep processing on a machine you control when the content isn’t meant to leave your hands.

After conversion, spot-check two things: the sender and date line in the converted file, and whether attachments came through. If either looks off, fall back to opening the MSG in Outlook on a machine that has it installed.

Why Some Apps Can’t Read MSG At All

MSG is a Microsoft-defined structure built to represent many Outlook item types, not just mail messages. Outlook Item (.msg) file format specification describes the structure and the range of items it can represent.

That complexity is why opening MSG in a text editor rarely helps. You might see fragments of readable text, yet you won’t get a clean email view, and attachments won’t be easy to extract.

Library of Congress format notes for MSG gives a preservation-focused overview and explains why compatibility varies across tools.

Troubleshooting Checklist When MSG Won’t Open

Work through this list in order. Stop as soon as the problem clears.

Check	What To Do	What It Tells You
File association	Set .msg to open with Outlook in Default apps	Windows was routing the file to the wrong app
Outlook version	Try opening in classic Outlook if available	New Outlook build may handle MSG differently
Blocked file	Right-click the MSG, open Properties, check Unblock	Windows restricted the file due to download origin
File integrity	Ask the sender to resend the MSG	The original transfer may have corrupted the file
Permissions	Move the file to Documents, then open it	You may not have rights in the current folder
Attachment issues	Save an attachment to disk, then open it from the folder	The attachment viewer is the real issue
Security scan	Scan the MSG and any saved attachments	Reduces risk from malicious content

File Handling Habits That Save Time

MSG files tend to pile up in downloads folders. A simple setup keeps them from turning into a mess.

• Name files clearly: Use a pattern like Sender-Subject-Date.msg so you can spot the right one quickly.
• Store related items together: Keep the MSG and extracted attachments in one folder for that thread.
• Keep originals: If you convert to PDF or EML, keep the original MSG beside it.
• Save attachments before opening: It’s cleaner than opening from preview, and it reduces surprises from temp folders.

Once you get those habits in place, MSG stops being a recurring chore and turns into a steady routine.