Microsoft S/MIME
Performs S/MIME digital signing, encryption and decryption for email messages in Outlook on the web.
Microsoft S/MIME: Secure Email Functionality on Edge
Microsoft S/MIME is a secure email extension for the Edge browser that simplifies security. It allows users to send digitally signed, encrypted and decrypted email messages through Outlook on the web. This guarantees email authentication, integrity, and confidentiality. Enhance your email security with Microsoft S/MIME.
Add-on stats
Rating: 2.20 
2 new ratings
(622)
Creation date: 2020-05-19
Risk impact: Moderate risk impact
Risk likelihood:
Manifest version: 2
Permissions:
- https://*/owa/*
- nativeMessaging
- activeTab
- storage
Size: 56.89K
URLs: Website ,Privacy policy
Ranking
# 70 ▲ 2
Other platforms
Not available on Chrome
Not available on Android
Not available on Firefox
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Add-on summary
Performs S/MIME digital signing, encryption and decryption for email messages in Outlook on the web.
User reviews
These summaries are automatically generated weekly using AI based on recent user reviews.
Edge Add-on Store does not verify user reviews, so some user reviews may be inaccurate,
spammy, or outdated. Pros
Cons
- Does not work with the new Outlook version.
- Extension appears to be installed but Outlook indicates it is not.
- Users experience errors when trying to verify digital signatures.
- Extension causes emails to not load or display properly.
- Mixed experiences where it works for some users but not for others.
Most mentioned
- The extension doesn't work in the new version of Outlook.
- Error messages about the extension not being installed despite it being installed in the browser.
- The loading issue prevents emails from being viewed properly.
- Many users report frustration with the lack of functionality compared to previous versions.
User reviews
useless PIECE OF GARGAGE
by Fernando, 2025-01-23
ING. LUIS OCTAVIO ROJAS FLORES
SEGURIDAD INDUSTRIAL
by ROJAS,, 2025-01-18
S/MIME isn't available for the desktop application and this has apparently never worked and still does not work in 2025.
by Jacob, 2025-01-16
Add-on safety
Risk impact
Microsoft S/MIME requires a few sensitive permissions. Exercise caution before installing.
Risk likelihood
Microsoft S/MIME has earned a good reputation and can be trusted.
Upgrade to see risk analysis details