B Evidence Grade B Graded accuracy verified by the review judge Safe to Cite Current

6.49%

6.49% -- email client market share for Outlook Desktop (2026-05)

Name: Email Client Market Share Statistics
Creator: Lighthouse Intelligence
Published: 2026-09-07

2026-05 · n=1,000,000,000 · Litmus

Outlook Desktop held a 6.49% share of global email opens in May 2026 according to Litmus Email Analytics.

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Attribution: Litmus View source

Lighthouse Research Team

Last verified: 2026-09-07 · How we verify data →

Source verified Evidence graded

Value

6.49%

Unit

Percentage

Data Vintage

2026-05

Entity

Outlook Desktop

Sample Size

1,000,000,000

Evidence Quality

Strong, reliable evidence

Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.

61/100 confidence

Single source - not yet corroborated

Score breakdown

Extraction

Source Trust

Citation Chain

Independence

Methodology

Freshness

Source

Litmus Primary Tier B

https://www.aurorasendcloud.com/blog/email-client-market-share ↗

Confidence: 53/100 Vintage: 2026-05 Channel: Common Crawl

Source Article

Email Client Market Share 2026: Key Data And Trends

Original Research

Litmus · Original study ↗

Methodology

Aggregated email open data from Litmus Email Analytics; over 1 billion opens. Notably important for B2B email rendering due to Word-based display engine.

Methodology documented

Segmentation

Industrymarketing

Cite this stat

Plain Text

Outlook Desktop: 6.49% email client market share. Source: Litmus (2026-05). Via Lighthouse Intelligence -- https://lighthousedata.io/data/outlook-desktop-email-client-market-share-2026

HTML Embed

<blockquote cite="https://lighthousedata.io/data/outlook-desktop-email-client-market-share-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>6.49%</strong> -- email client market share for Outlook Desktop<br><small>Source: Litmus (2026-05) · <a href="https://lighthousedata.io/data/outlook-desktop-email-client-market-share-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>

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