Cybersecurity · head to head
Microsoft Defender vs Proton Mail
Microsoft Defender
Cybersecurity
Always-on protection for you and your family's data and devices
- From
- $12/month
- Rated
- -
The short version
- Only Proton Mail has a free tier, so it costs nothing to try first.
- Each has a real cost: Microsoft Defender defender Suite requires existing Microsoft 365 E3 or equivalent base licensing; Proton Mail paid plan pricing not displayed on vendor site
- Prices and features above were last checked on 29 August 2026.
Where they differ
Only the attributes on which Microsoft Defender and Proton Mail actually diverge.
| Attribute | Microsoft Defender | Proton Mail |
|---|---|---|
| Starting price | $12/month | Free |
| Pricing model | subscription | freemium |
| Free tier | No | Yes |
Identical on both: platforms (Web), user rating (Not yet rated), category (Cybersecurity).
What people use each for
The jobs each tool is most often brought in to do.
Microsoft Defender
- Endpoint security and threat protectionnot Proton Mail
- Identity and access securitynot Proton Mail
- Email threat protectionnot Proton Mail
- SaaS application security monitoringnot Proton Mail
Proton Mail
- Encrypted email communicationnot Microsoft Defender
- Privacy-focused email servicenot Microsoft Defender
- Family email protectionnot Microsoft Defender
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Microsoft Defender
- Defender Suite requires existing Microsoft 365 E3 or equivalent base licensing
- Some Defender products use pay-as-you-go pricing with variable costs
- Prices vary based on Microsoft agreements, requiring sales contact for custom quotes
Proton Mail
- Paid plan pricing not displayed on vendor site
- Free tier limited to 1 GB storage
- Free tier limited to single email address
Pricing, plan by plan
Microsoft Defender
$12/month- Microsoft Defender Suite$12/month
- Endpoint protection
- Identity threat detection
- Email security
- Microsoft 365 E5 with Defender$60/month
- Includes Defender Suite
- Microsoft Teams included
- Comprehensive security and compliance
- Microsoft Defender Vulnerability Management Add-on$2/month
- Vulnerability scanning and management
- One-month free trial available
- Annual commitment required
Proton Mail
FreeNo published plan breakdown. See the Proton Mail review.
Which should you pick?
Choose Microsoft Defender if
Nothing in the data separates Microsoft Defender from Proton Mail on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is Microsoft Defender or Proton Mail better?
- Neither clearly leads. Microsoft Defender starts at $12/month and Proton Mail at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Microsoft Defender or Proton Mail?
- Proton Mail has a free tier; the other does not. Paid plans start at $12/month for Microsoft Defender and Free for Proton Mail.
- Does Microsoft Defender or Proton Mail run on more platforms?
- Both run on Web, so platform support will not decide this one for you.
- Can I use Proton Mail for free?
- Yes. Proton Mail has a free tier, so you can try it without paying. Microsoft Defender starts at $12/month.
- What is Microsoft Defender best used for?
- Microsoft Defender is most often used for endpoint security and threat protection, identity and access security, email threat protection, saas application security monitoring. Of those, endpoint security and threat protection and identity and access security are not what Proton Mail is typically brought in for.
Answered from the vendors’ own pages
Microsoft Defender: How much does Microsoft Defender Suite cost?
Microsoft Defender Suite costs $12/user/month (paid yearly), but requires existing Microsoft 365 E3 or equivalent base licensing. It includes endpoint protection, identity threat detection, email security, and SaaS application monitoring.
SourceProton Mail: Is there a free version of Proton Mail?
Yes, Proton Mail offers a free plan with 1 GB storage, 1 encrypted email address, and basic features like folders, labels, and filters.
SourceMicrosoft Defender: What add-ons are available for Microsoft Defender?
Microsoft Defender Vulnerability Management Add-on costs $2/user/month with annual commitment and includes a one-month free trial. Additional pay-as-you-go products include External Attack Surface Management, Cloud Security Posture Management, and Sentinel.
SourceProton Mail: What does the Mail Plus plan include?
Mail Plus includes 15 GB storage, 10 encrypted email addresses, support for 1 custom domain, 10 hide-my-email aliases, priority support, and access to Proton Calendar.
SourceMicrosoft Defender: Is Defender included in Microsoft 365 E5?
Yes, Microsoft Defender Suite is included in Microsoft 365 E5 at $60/user/month (paid yearly with Teams). Prices may vary based on Microsoft agreements, requiring contact with Sales for customized quotes.
SourceProton Mail: What is included in Proton Unlimited?
Proton Unlimited provides 500 GB storage, 15 email addresses, 3 custom domains, unlimited hide-my-email aliases, access to Mail, Calendar, VPN, Drive, and Pass, plus dedicated support.
SourceProton Mail: Does Proton Mail offer a money-back guarantee?
Yes, Proton Mail provides a 30-day money-back guarantee for paid plans.
SourceRelated pages
More on Microsoft Defender
More on Proton Mail
Other head to heads
- Microsoft Defender vs Bitdefender Total Security
- Microsoft Defender vs Norton 360
- Microsoft Defender vs 1Password
- Microsoft Defender vs LastPass
- Microsoft Defender vs McAfee Total Protection
- Microsoft Defender vs Proofpoint
- Microsoft Defender vs CrowdStrike Falcon
- Microsoft Defender vs Avast One
- Microsoft Defender vs ESET NOD32 Antivirus
- Microsoft Defender vs Cybereason Defense Platform
- Microsoft Defender vs Fortinet FortiGate
- Microsoft Defender vs VMware Carbon Black
- Microsoft Defender vs Wireshark
- Microsoft Defender vs WorkOS
- Microsoft Defender vs Zscaler Internet Access
- Microsoft Defender vs Milestone XProtect
- Microsoft Defender vs Osano
- Microsoft Defender vs Bitdefender VPN
- Microsoft Defender vs Tuta
- Microsoft Defender vs OneTrust
- Microsoft Defender vs Brave Browser
- Microsoft Defender vs Mullvad VPN
- Microsoft Defender vs IVPN
- Microsoft Defender vs BeyondTrust
- Microsoft Defender vs Surfshark
- Microsoft Defender vs Acunetix
- Microsoft Defender vs Aikido
- Microsoft Defender vs Arnica
- Microsoft Defender vs Authelia
- Microsoft Defender vs Authy
- Microsoft Defender vs Baffle
- Proton Mail vs Bitdefender Total Security
- Proton Mail vs Norton 360
- Proton Mail vs 1Password
- Proton Mail vs LastPass
- Proton Mail vs McAfee Total Protection
- Proton Mail vs Proofpoint
- Proton Mail vs CrowdStrike Falcon
- Proton Mail vs Avast One
- Proton Mail vs ESET NOD32 Antivirus
- Proton Mail vs Cybereason Defense Platform
- Proton Mail vs Fortinet FortiGate
- Proton Mail vs VMware Carbon Black
- Proton Mail vs Wireshark
- Proton Mail vs WorkOS
- Proton Mail vs Zscaler Internet Access
- Proton Mail vs Milestone XProtect
- Proton Mail vs Osano
- Proton Mail vs Bitdefender VPN
- Proton Mail vs Tuta
- Proton Mail vs OneTrust
- Proton Mail vs Brave Browser
- Proton Mail vs Mullvad VPN
- Proton Mail vs IVPN
- Proton Mail vs BeyondTrust
- Proton Mail vs Surfshark
- Proton Mail vs Acunetix
- Proton Mail vs Aikido
- Proton Mail vs Arnica
- Proton Mail vs Authelia
- Proton Mail vs Authy
- Proton Mail vs Baffle