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Proton Mail vs Microsoft Defender for Office 365 Comparison (2026)

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Proton Mail logo

Proton Mail

Microsoft Defender for Office 365 logo

Microsoft Defender for Office 365

Overview

ProtonMail is a web-based email management platform that helps businesses securely transmit encrypted emails between users both inside and outside of the organisation.

Microsoft Defender for Office 365 is a cloud-based email security software designed to help businesses automatically detect, investigate, and resolve potential email threats on a centralized platform. Supervisors can configure security policies, perform spoof checks, and maintain a record of reported incidents.

  • Platforms supported
  • Web-based
  • iPhone app
  • Android app
  • Windows Phone app
  • Typical customers
  • Freelancers
  • Small businesses
  • Mid size businesses
  • Large enterprises
  • Customer support
  • Phone
  • Online
  • Knowledge base
  • Video tutorials
view more detailsview details
  • Platforms supported
  • Web-based
  • iPhone app
  • Android app
  • Windows Phone app
  • Typical customers
  • Freelancers
  • Small businesses
  • Mid size businesses
  • Large enterprises
  • Customer support
  • Phone
  • Online
  • Knowledge base
  • Video tutorials
view more detailsview details

Video & Screenshots

No videos yet

Pricing

Starting from

6.99

/user

Per month

  • Free trial available
  • Credit cardless trial
  • Free account
  • Subscription based

Starting from

Empty state illustration for "No pricing info"

No pricing info

  • Free trial available
  • Credit cardless trial
  • Free account
  • Subscription based

User reviews

4.5

123

5

4

3

2

1

82

31

5

3

2

  • Value for money
  • Ease of use
  • Features
  • Customer support
72%
would recommend this app

4.6

243

5

4

3

2

1

158

71

8

5

1

  • Value for money
  • Ease of use
  • Features
  • Customer support
76%
would recommend this app

Pros

“The ability to generate a mask email address is fabulous and the integration with the brilliant suite of other Proton products is seamless.”
GS

Gareth S.

Area Inclusion Worker

“The snooze function is great, the folders simple to create and the spam folder is intelligent, effective and means you don’t have to go trawling for that email you missed.”
GS

Gareth S.

Area Inclusion Worker

“Storage on the free plan has been generous too, and no ads which is a nice change from Gmail.”
DM

Davis M.

Head of Finance

Pros

“Features such as Safe Links and Safe Attachments add an extra layer of protection without significantly impacting user productivity.”
Verified reviewer profile picture

Swetha C.

Technical Program Mananger

“The platform also integrates well with other Microsoft security products, making it a strong choice for organisations already invested in Microsoft 365.”
JD

Josh D.

IT Support Engineer

“For people who rely heavily on email for advocacy, school, benefits, medical care, and family communication, security matters.”
MC

Michelle C.

CEO

Cons

“The UI is not that great, Switch between other mails is annoying when using a lot of emails.”
Verified reviewer profile picture

Ayushmaan S.

Developer

“My only option is to purchase a significantly more expensive monthly subscription for 5 months (instead of the 9 I had left).”
DI

Dan I.

CTO

“That’s genuinely difficult to answer. ”
GS

Gareth S.

Area Inclusion Worker

Cons

“Some of the reports, alerts, and security language can feel too technical, especially for people who are not IT professionals.”
MC

Michelle C.

CEO

“Some advanced phishing or spoofing protections aren’t perfect and may miss high-level impersonation attacks without additional layers or tuning.”
MW

Mekailah W.

Ceo

“Steep learning curve when configuring advanced rules or email routing, and support documentation isn't always compatible with our usage scenario.”
AO

Alvin O.

Cyber Security Specialist

  • Vendor responds to reviews
  • Last review3 months ago
  • Vendor responds to reviews
  • Last reviewa month ago

Key features

  • Total features12
  • Access Controls/Permissions
  • Activity Dashboard
  • Alerts/Escalation
  • Allow/Block List
  • Anti Spam
  • Data Loss Prevention
  • Email Attachment Protection
  • Email Filtering
  • Email Management
  • Email Routing
  • Encryption
  • Filtering
  • Greylisting
  • Microsoft Outlook Integration
  • Phishing Protection
  • Policy Management
  • Real-Time Monitoring
  • Reporting/Analytics
  • SURLB/URIBL Filtering
  • Spam Blocker
  • Spam Detection
  • Spam Quarantine
  • Third-Party Integrations
  • Threat Protection
  • Threat Response
  • Two-Factor Authentication
  • Whitelisting/Blacklisting
  • Total features22
  • Access Controls/Permissions
  • Activity Dashboard
  • Alerts/Escalation
  • Allow/Block List
  • Anti Spam
  • Data Loss Prevention
  • Email Attachment Protection
  • Email Filtering
  • Email Management
  • Email Routing
  • Encryption
  • Filtering
  • Greylisting
  • Microsoft Outlook Integration
  • Phishing Protection
  • Policy Management
  • Real-Time Monitoring
  • Reporting/Analytics
  • SURLB/URIBL Filtering
  • Spam Blocker
  • Spam Detection
  • Spam Quarantine
  • Third-Party Integrations
  • Threat Protection
  • Threat Response
  • Two-Factor Authentication
  • Whitelisting/Blacklisting

Integrations

  • Total integrations9
  • Canary Mail
  • Microsoft Outlook
  • Postbox
  • Proton Drive
  • Proton Pass
  • Rambox
  • Sales Robots
  • Shopify
  • Thunderbird
  • Total integrationsN/A
  • Canary Mail
  • Microsoft Outlook
  • Postbox
  • Proton Drive
  • Proton Pass
  • Rambox
  • Sales Robots
  • Shopify
  • Thunderbird

Alternatives

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