Microsoft 365 vs Proton Mail

Microsoft 365 is the more common of the two in our index: it runs on 20,844 websites against 323 for Proton Mail, and 90 sites use both. Counts come from real scans, not vendor claims.

Microsoft 365: 20,844
Proton Mail: 323

Microsoft 365

Microsoft 365 is a line of subscription services offered by Microsoft as part of the Microsoft Office product line.

Indexed sites: 20,844
Share of Webmail: 65%

Well-known sites using it

All 20,844 sites

Proton Mail

Proton Mail is the world’s largest secure email service with over 70 million users. Available on Web, iOS, Android, and desktop. Protected by Swiss privacy law.

Indexed sites: 323
Share of Webmail: 1%

Well-known sites using it

All 323 sites

Used together

90 sites run both Microsoft 365 and Proton Mail. That is 28% of the sites using Proton Mail, the smaller of the two.

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