Proton Mail vs Outlook: Which Should You Use?
A practical comparison of features, pricing, ease of use, best use cases and value for money.
Proton Mail vs Outlook at a glance
| Criteria | Proton Mail | Outlook |
|---|---|---|
| Main use case | Private business email | All-round Microsoft 365 email |
| Encryption | End-to-end by default | In-transit; E2E requires add-ons |
| AI features | Minimal by design | Microsoft Copilot integration |
| Custom domains | Yes (paid) | Yes (Microsoft 365) |
| Pricing | Free / from $3.99/mo | Free / from $6/user/mo (M365 Business) |
| Free plan | Yes (1GB) | Yes (15GB) |
| Best for | Privacy-focused founders | Microsoft 365 teams |
| Weaknesses | Fewer enterprise features | No native E2E encryption |
| ToolMoneyLab score | 94 / 100 | 92 / 100 |
| CTA | Try Proton Mail → | Try Outlook → |
Choose Proton Mail if you want an inbox that's private by default, independent of Microsoft and bundled with a full privacy suite.
Choose Outlook if you rely on Microsoft 365 apps, Teams and Copilot and want a fully integrated stack.
The details that matter
| Feature | Proton Mail | Outlook |
|---|---|---|
| Main use case | Private business email | All-round Microsoft 365 email |
| Encryption | End-to-end by default | In-transit; E2E requires add-ons |
| AI features | Minimal by design | Microsoft Copilot integration |
| Custom domains | Yes (paid) | Yes (Microsoft 365) |
| Pricing | Free / from $3.99/mo | Free / from $6/user/mo (M365 Business) |
| Free plan | Yes (1GB) | Yes (15GB) |
| Best for | Privacy-focused founders | Microsoft 365 teams |
| Weaknesses | Fewer enterprise features | No native E2E encryption |
| ToolMoneyLab score | 94 / 100 | 92 / 100 |
What you'll actually pay
Proton Mail Plus starts at $3.99/mo. Outlook is free personally; Microsoft 365 Business Standard is around $12.50/user/mo. Pricing changes often — check the official sites before subscribing.
Pricing changes frequently, so always check the official website before subscribing.
What we liked and didn't
Proton Mail — Pros
- End-to-end encryption by default
- Swiss privacy jurisdiction
- Custom domains and hide-my-email aliases
- Bundled with Drive, VPN and Pass on Unlimited
Proton Mail — Cons
- Fewer enterprise integrations than Outlook
- No native AI copilot
Outlook — Pros
- Deep Microsoft 365 and Copilot integration
- Powerful calendar and Teams integration
- Enterprise-grade admin and compliance
- Rich third-party ecosystem
Outlook — Cons
- Not end-to-end encrypted by default
- Free version bundled with ads
The bottom line
Choose Proton Mail if end-to-end encryption is essential.
Choose Outlook if you're standardising on Microsoft 365.
Proton Mail
End-to-end encrypted email from Switzerland.
Outlook
Microsoft's email client, tightly integrated with Microsoft 365 and Copilot.
Disclosure: We may earn a commission if you sign up through links on this page, at no additional cost to you. Our comparisons remain independent and based on practical testing.
Proton Mail vs Outlook FAQ
Is Outlook end-to-end encrypted?+
Not by default — E2E requires add-ons like Microsoft Purview Message Encryption.
Which is better for teams?+
Outlook, thanks to Microsoft 365 integration; Proton Mail Business is a strong privacy-first alternative.
Which is better for calendars?+
Outlook's calendar and Teams integration is best-in-class; Proton Calendar is encrypted.
Which has better AI?+
Outlook, via Microsoft Copilot.
Can I migrate to Proton Mail from Outlook?+
Yes — Proton's Easy Switch tool imports Outlook mail and contacts.
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