--- title: "Microsoft Outlook vs Proton Mail: Which is searched more?" description: "Is Microsoft Outlook or Proton Mail more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Email clients 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/microsoft-outlook-vs-proton-mail" publisher: "Brandwave" --- # Microsoft Outlook vs Proton Mail: Which is searched more? Is Microsoft Outlook or Proton Mail more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Email clients 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**: Microsoft Outlook and Proton Mail - **Competitive set**: Email clients - **Market**: Global - **Month measured**: Sep 2026 - **Microsoft Outlook Share of Search**: 83.1% - **Proton Mail Share of Search**: 0.02% ## Is Microsoft Outlook or Proton Mail more popular in search? - In September 2026, Microsoft Outlook had more branded searches than Proton Mail among email clients worldwide. Microsoft Outlook had about 1.2 million branded searches, while Proton Mail had 320. Microsoft Outlook made up 83.1% of all email client searches we track, and Proton Mail accounted for 0.02%. - Microsoft Outlook was ahead of Proton Mail in every measured month of the 12 months ending September 2026. - Across the 12 months ending September 2026, Microsoft Outlook’s share of searches among email clients worldwide moved from 86.7% to 83.1%, and its estimated monthly branded searches moved from 1.8M to 1.2M. - Across the 12 months ending September 2026, Proton Mail’s share of searches among email clients worldwide moved from <0.01% to 0.02%, and its estimated monthly branded searches moved from 140 to 320. ## Top email clients in ChatGPT and Google AI Overviews In three ChatGPT questions and two Google AI Overviews, Microsoft Outlook appeared in all five answers. Proton Mail was mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Microsoft Outlook was listed before Proton Mail in every answer. Brands get a higher AI rank if they are mentioned earlier in the answers that list options. | Brand | AI rank | ChatGPT answers that named it | Google AI Overviews that named it | All answers that named it | | --- | --- | --- | --- | --- | | Microsoft Outlook | 1st | 3 of 3 | 2 of 2 | 5 of 5 | | Apple Mail | 2nd | 3 of 3 | 2 of 2 | 5 of 5 | | Thunderbird | 3rd | 3 of 3 | 1 of 2 | 4 of 5 | | Spark | 4th | 2 of 3 | 2 of 2 | 4 of 5 | | Proton Mail | 5th | 2 of 3 | 1 of 2 | 3 of 5 | | Superhuman | 6th | 2 of 3 | 1 of 2 | 3 of 5 | | Airmail | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | | Newton | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | ## Every AI answer about email clients - Asked ChatGPT "Which email client should I use?": 1. Microsoft Outlook, 2. Apple Mail, 3. Proton Mail, 4. Thunderbird - Asked ChatGPT "What are the best email clients?": 1. Microsoft Outlook, 2. Thunderbird, 3. Apple Mail, 4. Spark, 5. Proton Mail, 6. Superhuman - Asked ChatGPT "What's the best email client for daily email management?": 1. Spark, 2. Microsoft Outlook, 3. Thunderbird, 4. Apple Mail, 5. Superhuman - Searched Google, AI Overview "email client": 1. Thunderbird, 2. Microsoft Outlook, 3. Spark, 4. Apple Mail - Searched Google, AI Overview "best email app": 1. Microsoft Outlook, 2. Apple Mail, 3. Spark, 4. Proton Mail, 5. Superhuman Not named in any answer: Airmail and Newton. Brands are listed in the order each answer named them. The answers were collected in the United States on October 20, 2026. ## How did search popularity change for email clients worldwide in September 2026? - In September 2026, Microsoft Outlook lost share of searches among email clients worldwide, from 83.8% to 83.1%. - Estimated monthly branded searches for Proton Mail worldwide rose 128.6% over 12 measured months, from 140 to 320 in September 2026. ## Month by month | Month | Microsoft Outlook estimated searches | Microsoft Outlook Share of Search | Microsoft Outlook rank | Proton Mail estimated searches | Proton Mail Share of Search | Proton Mail rank | | --- | --- | --- | --- | --- | --- | --- | | Oct 2025 | 1.8M | 86.7% | 1 | 140 | <0.01% | 8 | | Nov 2025 | 1.5M | 84.8% | 1 | 140 | <0.01% | 8 | | Dec 2025 | 1.2M | 81.6% | 1 | 140 | <0.01% | 8 | | Jan 2026 | 1.5M | 84.1% | 1 | 170 | <0.01% | 8 | | Feb 2026 | 1.5M | 86.4% | 1 | 170 | <0.01% | 8 | | Mar 2026 | 1.5M | 85.7% | 1 | 210 | 0.01% | 8 | | Apr 2026 | 1.2M | 84.4% | 1 | 170 | 0.01% | 8 | | May 2026 | 1.2M | 84.9% | 1 | 170 | 0.01% | 8 | | Jun 2026 | 1.2M | 85.1% | 1 | 210 | 0.01% | 8 | | Jul 2026 | 1M | 83.5% | 1 | 210 | 0.02% | 8 | | Aug 2026 | 1.2M | 83.8% | 1 | 260 | 0.02% | 8 | | Sep 2026 | 1.2M | 83.1% | 1 | 320 | 0.02% | 8 | ## How each brand is measured Brandwave collects information about searches that people make online using Microsoft Outlook’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 Outlook**: Measured on the search term “microsoft outlook”. - **Proton Mail**: Measured on the search term “email proton mail”. - [Microsoft Outlook profile](/demand/global-en/brands/microsoft-outlook) - [Proton Mail profile](/demand/global-en/brands/proton-mail) - [All email clients worldwide](/demand/global-en/categories/email-clients): The set both shares are measured inside, 8 brands. ## Methodology - [How is the Brand Demand Index measured?](/demand/methodology): Where the figures come from, what they compare, and how they may be reused. ## Frequently asked questions ### Is Microsoft Outlook or Proton Mail more popular in search? In September 2026, Microsoft Outlook had more branded searches than Proton Mail among email clients worldwide. Microsoft Outlook had about 1.2 million branded searches, while Proton Mail had 320. Microsoft Outlook made up 83.1% of all email client searches we track, and Proton Mail accounted for 0.02%. ## Cite this page Brandwave. "Microsoft Outlook vs Proton Mail: Which is searched more?". https://gobrandwave.com/demand/global-en/compare/microsoft-outlook-vs-proton-mail This page is also available as HTML at https://gobrandwave.com/demand/global-en/compare/microsoft-outlook-vs-proton-mail. Brandwave publishes an index of its Markdown pages at https://gobrandwave.com/llms.txt.