B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Dated
1%
1% -- email client market share for Outlook.com (2021-07)
Outlook.com held a 1% email client market share worldwide as of July 1, 2021, based on 1.06 billion email opens tracked by Litmus.
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Lighthouse Research Team
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Source verified
Evidence graded
Value
1%
Unit
Percentage
Data Vintage
2021-07
Entity
Sample Size
1,060,000,000
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
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Litmus
Primary
Tier A
http://emailclientmarketshare.com/ ↗
Source Article
Email Client Market Share
#1 Apple iPhone 38% -6.99
#2 Gmail 30% +12.34
#3 Apple Mail 10% -2.15
#4 Outlook 7% -1.5
#5 Yahoo! Mail 5% -0.72
#6 Google Android 2% -0.12
#7 Apple iPad 1% -0.27
#8 Outlook.com 1% -0.02
#9 Samsung Mail 1% -0.18
#10 Windows Live Mail 0% -0.04
Email client market share
Email client usage worldwide, c…
Original Research
Litmus
· Original study ↗
Methodology
Litmus Email Analytics data compiled from 1.06 billion worldwide email opens; figures current as of 1 July 2021; month-over-month change of -0.02 points
Methodology documented
Trend Over Time
| Period | Value | Change |
|---|---|---|
| 2014-01 | 6% | |
| 2014-03 | 6% | 0% |
| 2014-10 | 5% | -16.7% |
| 2014-11 | 5% | 0% |
| 2015 | 5% | 0% |
| 2015 | 5% | 0% |
| 2015-03 | 5% | 0% |
| 2015-06 | 4% | -20.0% |
| 2015-07 | 4% | 0% |
| 2016 | 5% | +25.0% |
| 2017-05 | 5% | 0% |
| 2017-12 | 4% | -20.0% |
| 2018-05 | 3% | -25.0% |
| 2018-09 | 3% | 0% |
| 2018-10 | 3% | 0% |
| 2019-10 | 2% | -33.3% |
| 2021-07 (current) | 1% | -50.0% |
| 2026-05 | 0.38% | -62.0% |
Segmentation
Industrymarketing
Cite this stat
Plain Text
Outlook.com: 1% email client market share. Source: Litmus (2021-07). Via Lighthouse Intelligence -- https://lighthousedata.io/data/outlook-com-email-client-market-share-2021
HTML Embed
<blockquote cite="https://lighthousedata.io/data/outlook-com-email-client-market-share-2021" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>1%</strong> -- email client market share for Outlook.com<br><small>Source: Litmus (2021-07) · <a href="https://lighthousedata.io/data/outlook-com-email-client-market-share-2021" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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