B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
0.38%
0.38% -- email client market share for Outlook.com (2026-05)
Outlook.com accounted for 0.38% of global email client market share in May 2026.
Attribution:
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Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
0.38%
Unit
Percentage
Data Vintage
2026-05
Entity
Sample Size
1,000,000,000
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Litmus
Primary
Tier B
https://www.aurorasendcloud.com/blog/email-client-market-share ↗
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.
Methodology documented
Trend Over Time
| Period | Value | Change |
|---|---|---|
| 2014-03 | 6% | |
| 2014-10 | 5% | -16.7% |
| 2015 | 5% | 0% |
| 2015-06 | 4% | -20.0% |
| 2015-07 | 4% | 0% |
| 2016 | 5% | +25.0% |
| 2017-12 | 4% | -20.0% |
| 2018-05 | 3% | -25.0% |
| 2019-10 | 2% | -33.3% |
| 2026-05 (current) | 0.38% | -81.0% |
Segmentation
Industrymarketing
Cite this stat
Plain Text
Outlook.com: 0.38% email client market share. Source: Litmus (2026-05). Via Lighthouse Intelligence -- https://lighthousedata.io/data/outlook-com-email-client-market-share-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/outlook-com-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>0.38%</strong> -- email client market share for Outlook.com<br><small>Source: Litmus (2026-05) · <a href="https://lighthousedata.io/data/outlook-com-email-client-market-share-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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