B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
6.9%
6.9% -- microsoft outlook combined market share for Microsoft Outlook (Outlook Desktop plus Outlook.com combined) (2026-05)
Microsoft's combined email client market share (Outlook desktop and Outlook.com) was nearly 6.9% in May 2026.
- Reported as 'nearly 6.9%', calculated from Outlook desktop (6.49%) and Outlook.com (0.38%)
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
6.9%
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
Reported as 'nearly 6.9%'; sum of Outlook Desktop (6.49%) and Outlook.com (0.38%) equals 6.87%.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Microsoft Outlook (Outlook Desktop plus Outlook.com combined): 6.9% microsoft outlook combined market share. Source: Litmus (2026-05). Via Lighthouse Intelligence -- https://lighthousedata.io/data/microsoft-outlook-combined-market-share-2026
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<blockquote cite="https://lighthousedata.io/data/microsoft-outlook-combined-market-share-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>6.9%</strong> -- microsoft outlook combined market share for Microsoft Outlook (Outlook Desktop plus Outlook.com combined)<br><small>Source: Litmus (2026-05) · <a href="https://lighthousedata.io/data/microsoft-outlook-combined-market-share-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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