Microsoft Exchange Online vs Proton Mail

Microsoft Exchange Online9.2Visit Proton Mail8.8Visit

Higher score Microsoft Exchange Online #2 in Email Hosting 9.2/10 Paid ✓ 1 of 3 features Visit Microsoft

vs

Proton Mail #5 in Email Hosting 8.8/10 Free plan Free planFree trial✓ 0 of 3 features Visit Proton Mail

• Microsoft Exchange Online fits best

  Outlook-centered businesses and administrators

• Proton Mail fits best

  Privacy-conscious users wanting polished encrypted email

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Side by side

Feature	Microsoft Exchange Online 9.2/10 Visit ↗	Proton Mail 8.8/10 Visit ↗
At a glance
Editor score	9.2	8.8
Ranking	#2 in Email Hosting	#5 in Email Hosting
Best for	Outlook-centered businesses and administrators	Privacy-conscious users wanting polished encrypted email
Pricing model	Paid	Free plan + paid
Starting price	—	$3.99/user/mo
Free plan	—	✓ (best)
Free trial	—	14 days
Deployment	Cloud, Browser extension	Cloud, Desktop, Mobile
Platforms	Web, Windows, macOS, iOS, Android	Web, Windows, macOS, Linux, iOS, Android
Support	Phone, Docs · 24/7	Email, Live chat, Tickets, Docs
Integrations	2 integrations	4 integrations
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Microsoft Exchange Online 1/3 · Proton Mail 0/3
IMAP/POP support	Not checked yet	Not checked yet
Calendar included	Not checked yet	Not checked yet
Migration tools	✓ (best)	Not checked yet
Specs
Storage per mailbox	50 GB (best)	15 GB
Email aliases	Not checked yet	Not checked yet
Attachment limit	Not checked yet	Not checked yet
Mobile app access	Not checked yet	Not checked yet
Our review
Pros	50 GB mailboxes, with up to 1.5 TB archives on Plan 2 Migration support for Exchange, IMAP, PST, and other systems Shared mailboxes, compliance tools, and Microsoft Graph access	End-to-end encryption between Proton Mail users Zero-access encryption for stored messages and attachments Custom domains, aliases, filters, and tracker blocking
Cons	There is no free plan Higher storage and built-in data loss prevention require Plan 2 Some archive capabilities depend on licensing and administrator enablement	Free plan includes only 1 GB of storage Custom domains require a paid plan Bridge is needed for desktop email client access
Our verdict	Microsoft Exchange Online is a cloud-hosted business email and calendaring service for organizations that need custom-domain email, Outlook access, mailbox administration, and compliance features. It supports email, calendars, and contacts… Read the review →	Proton Mail is an encrypted email service for individuals, organizations, journalists, activists, and businesses. It provides web, desktop, and mobile applications across Windows, macOS, Linux, iOS, and Android. Proton Mail users can send… Read the review →

Strengths and trade-offs

• Microsoft Exchange Online — where it wins

  • 50 GB mailboxes, with up to 1.5 TB archives on Plan 2
  • Migration support for Exchange, IMAP, PST, and other systems
  • Shared mailboxes, compliance tools, and Microsoft Graph access

  Where it doesn't

  • There is no free plan
  • Higher storage and built-in data loss prevention require Plan 2
  • Some archive capabilities depend on licensing and administrator enablement

• Proton Mail — where it wins

  • End-to-end encryption between Proton Mail users
  • Zero-access encryption for stored messages and attachments
  • Custom domains, aliases, filters, and tracker blocking

  Where it doesn't

  • Free plan includes only 1 GB of storage
  • Custom domains require a paid plan
  • Bridge is needed for desktop email client access

• Microsoft Exchange Online9.2/10 · Paid

  A deep Exchange service for organizations centered on Outlook and administration.

  Visit MicrosoftFull verdict →
• Proton Mail8.8/10 · Free plan

  A polished encrypted email service with a capable free plan and paid custom-domain support.

  Visit Proton MailFull verdict →