Question 1

Do I need Microsoft Outlook installed?

Accepted Answer

No. OpenMSG is completely standalone. No Outlook or Microsoft 365 needed.

Question 2

Is OpenMSG really free?

Accepted Answer

OpenMSG is free for individual use when downloaded from the Microsoft Store. For corporate environments requiring MSIX deployment or volume licensing, please refer to our pricing page.

Question 3

Does it work on Windows 11?

Accepted Answer

Yes. OpenMSG is fully optimised for Windows 11 and also supports Windows 10 (19041.0+).

Question 4

Is my data safe?

Accepted Answer

MSG files are processed entirely on your device — email content is never uploaded. The app collects anonymous usage analytics via PostHog and anonymous crash reports via BugSplat to help us improve the product. Both can be disabled via registry policy for enterprise deployments.

Question 5

How do I extract attachments?

Accepted Answer

Open the MSG file, click any attachment in the panel, and hit "Save Attachment."

Question 6

What file types are supported?

Accepted Answer

OpenMSG supports .msg files exported from Microsoft Outlook, including embedded images and nested attachments.

Question 7

How large can MSG files be?

Accepted Answer

OpenMSG handles files of any size. Even multi-megabyte emails with many attachments open in milliseconds.

Question 8

Can I save all attachments at once?

Accepted Answer

Yes. OpenMSG includes a 'Save All' feature that allows you to export all attachments from an email into a selected folder in one operation.

Question 9

How do I set OpenMSG as my default MSG viewer?

Accepted Answer

Right-click any .msg file → Open with → Choose another app → Select OpenMSG → tick "Always use this app."

Question 10

OpenMSG won't open after installing. What should I do?

Accepted Answer

Try restarting your PC. If the issue persists, uninstall and reinstall from the Microsoft Store. The app requires Windows 10 version 19041.0 or higher.

Question 11

Attachments aren't displaying correctly. How can I fix this?

Accepted Answer

Ensure you're running the latest version of OpenMSG from the Microsoft Store. Updates are applied automatically.

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