Microsoft 365 vs Proton Mail:Which is more popular by branded search?
In August 2026, Microsoft 365 had more branded searches than Proton Mail among business email providers worldwide. Microsoft 365 was estimated to have 13.7M branded searches compared to Proton Mail’s 4.1M, and held a 60.3% Share of Search versus Proton Mail’s 18.1%. Worldwide · English terms: these are worldwide searches for English-language branded terms.
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Which is more popular in search, Microsoft 365 or Proton Mail?
Compare services and tools used to provide hosted business email accounts. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time.
Share of Search by month for Microsoft 365, Proton Mail. The figures are in the table below the chart.
View monthly share of search table
| Month | Microsoft 365 | Proton Mail | Zoho Mail | Google Workspace | Fastmail |
|---|---|---|---|---|---|
| Oct 2025 | 75.2% | 9.7% | 9.7% | 4.9% | 0.51% |
| Nov 2025 | 75.4% | 11.1% | 7.4% | 5.6% | 0.48% |
| Dec 2025 | 71.5% | 12.9% | 8.6% | 6.4% | 0.55% |
| Jan 2026 | 71.3% | 13.8% | 7.6% | 6.7% | 0.59% |
| Feb 2026 | 73.2% | 11.6% | 7.8% | 6.9% | 0.5% |
| Mar 2026 | 71.2% | 13.8% | 7.6% | 6.8% | 0.59% |
| Apr 2026 | 67.3% | 14.8% | 9.9% | 7.4% | 0.52% |
| May 2026 | 68.6% | 15.1% | 8.3% | 7.4% | 0.64% |
| Jun 2026 | 63% | 16.8% | 11.3% | 8.2% | 0.72% |
| Jul 2026 | 58.2% | 19% | 12.7% | 9.3% | 0.81% |
| Aug 2026 | 60.3% | 18.1% | 12.1% | 8.7% | 0.78% |
| Sep 2026 | — | — | — | — | — |
How has the Microsoft 365 and Proton Mail comparison changed over the last 12 months?
3 findings
- Microsoft 365 was ahead of Proton Mail in every measured month of the 11 months ending August 2026.
- Across the 11 months ending August 2026, Microsoft 365’s estimated Share of Search among business email providers worldwide moved from 75.2% to 60.3%, and its estimated monthly branded searches moved from 26M to 13.7M.
- Across the 11 months ending August 2026, Proton Mail’s estimated Share of Search among business email providers worldwide moved from 9.7% to 18.1%, and its estimated monthly branded searches moved from 3.4M to 4.1M.
How did search popularity change for business email providers worldwide in August 2026?
2 changes
In August 2026, Microsoft 365 gained estimated Share of Search among business email providers worldwide, from 58.2% to 60.3%.
In August 2026, Proton Mail lost estimated Share of Search among business email providers worldwide, from 19% to 18.1%.
How each brand is measured
Brandwave collects information about searches that people make online using Microsoft 365’s and Proton Mail’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Microsoft 365
9 branded search terms
- business email microsoft 365
- email microsoft 365
- microsoft 365
- microsoft 365 app
- microsoft 365 business email
- microsoft 365 email
- microsoft 365 software
- microsoft365
- office 365
Proton Mail
7 branded search terms
- email proton mail
- proton mail
- proton mail app
- proton mail business email
- proton mail email
- proton mail software
- protonmail
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