---
title: "Fastmail vs Microsoft 365: Which is more popular by branded search?"
description: "Which is more popular in search, Fastmail or Microsoft 365? Compare estimated monthly branded-search demand and Share of Search inside the Business email providers set worldwide. 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."
canonical: "https://gobrandwave.com/demand/global-en/compare/fastmail-vs-microsoft-365"
publisher: "Brandwave"
---

# Fastmail vs Microsoft 365: Which is more popular by branded search?

Which is more popular in search, Fastmail or Microsoft 365? Compare estimated monthly branded-search demand and Share of Search inside the Business email providers set worldwide. 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.

## Key facts

- **Compared**: Fastmail and Microsoft 365
- **Competitive set**: Business email providers
- **Market**: Global
- **Month measured**: Aug 2026
- **Fastmail Share of Search**: 0.78%
- **Microsoft 365 Share of Search**: 60.3%

## Which is more popular in search, Fastmail or Microsoft 365?

- 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%.
- 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?

- In August 2026, Microsoft 365 gained estimated Share of Search among business email providers worldwide, from 58.2% to 60.3%.

## Month by month

| Month | Fastmail estimated searches | Fastmail Share of Search | Fastmail rank | Microsoft 365 estimated searches | Microsoft 365 Share of Search | Microsoft 365 rank |
| --- | --- | --- | --- | --- | --- | --- |
| Oct 2025 | 176K | 0.51% | 5 | 26M | 75.2% | 1 |
| Nov 2025 | 144K | 0.48% | 5 | 22.8M | 75.4% | 1 |
| Dec 2025 | 144K | 0.55% | 5 | 18.6M | 71.5% | 1 |
| Jan 2026 | 174K | 0.59% | 5 | 21.1M | 71.3% | 1 |
| Feb 2026 | 145K | 0.5% | 5 | 21.1M | 73.2% | 1 |
| Mar 2026 | 176K | 0.59% | 5 | 21.2M | 71.2% | 1 |
| Apr 2026 | 145K | 0.52% | 5 | 18.6M | 67.3% | 1 |
| May 2026 | 175K | 0.64% | 5 | 18.7M | 68.6% | 1 |
| Jun 2026 | 176K | 0.72% | 5 | 15.3M | 63% | 1 |
| Jul 2026 | 176K | 0.81% | 5 | 12.5M | 58.2% | 1 |
| Aug 2026 | 176K | 0.78% | 5 | 13.7M | 60.3% | 1 |
| Sep 2026 | — | — | — | — | — | — |

## 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**: Measured on the search terms “email fastmail”, “fastmail”, “fastmail app” and “fastmail com”, summed into one figure.
- **Microsoft 365**: Measured on the 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” and “office 365”, summed into one figure.

- [Fastmail profile](/demand/global-en/brands/fastmail)
- [Microsoft 365 profile](/demand/global-en/brands/microsoft-365)
- [All business email providers worldwide](/demand/global-en/categories/business-email-providers): The set both shares are measured inside, 5 brands.

## Methodology

- [How is branded search demand measured?](/demand/methodology): Where the figures come from, what they compare, and how they may be reused.

## Frequently asked questions

### Which is more popular in search, Fastmail or Microsoft 365?

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%.

## Cite this page

Brandwave. "Fastmail vs Microsoft 365: Which is more popular by branded search?". https://gobrandwave.com/demand/global-en/compare/fastmail-vs-microsoft-365

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