Fastmail vs Microsoft 365:Which is more popular by branded search?
In August 2026, Microsoft 365 had more branded searches than Fastmail among business email providers worldwide. Microsoft 365 was estimated to have 13.7M branded searches compared to Fastmail’s 176K, and held a 60.3% Share of Search versus Fastmail’s 0.78%. Worldwide · English terms: these are worldwide searches for English-language branded terms.
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Which is more popular in search, Fastmail or Microsoft 365?
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, Fastmail. 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 Fastmail and Microsoft 365 comparison changed over the last 12 months?
3 findings
- Microsoft 365 was ahead of Fastmail in every measured month of the 11 months ending August 2026.
- Across the 11 months ending August 2026, Fastmail’s estimated Share of Search among business email providers worldwide moved from 0.51% to 0.78%, and its estimated monthly branded searches held steady at 176K.
- 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.
How did search popularity change for business email providers worldwide in August 2026?
1 change
In August 2026, Microsoft 365 gained estimated Share of Search among business email providers worldwide, from 58.2% to 60.3%.
How each brand is measured
Brandwave collects information about searches that people make online using Fastmail’s and Microsoft 365’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.
Fastmail
4 branded search terms
- email fastmail
- fastmail
- fastmail app
- fastmail com
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
Put your own brand in this comparison
Brandwave tracks your branded demand next to the rival you actually watch, with your campaigns, spend and outcomes on the same timeline.