Email client popularity: June 2011

Each time a subscriber opens an email sent with Campaign Monitor, we keep track of which email client they're using. Since 2009, we've measured email client popularity across many billions of emails and occasionally collate that data to show interesting trends in email client usage.

Most popular email clients

Below is the email client market share as of June 2011. These numbers are not exclusive—some people use more than one email client during the month—which will register a vote for each client used.

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27.62%
Outlook
16.01%
iOS Devices (iPhone, iPad and iPod Touch)
12.14%
Hotmail
11.13%
Apple Mail
9.54%
Yahoo! Mail
7.02%
Gmail
1.84%
Windows Mail
1.70%
Android
1.25%
AOL
1.21%
Thunderbird
Email client Popularity  
Microsoft Outlook 27.62%  
Outlook 2000, 2003, Express 17.88%  
Outlook 2007 9.37%  
Outlook 2010 0.37%  
iOS Devices 16.01%  
iPhone 12.39%  
iPad 2.77%  
iPod Touch 0.85%  
Hotmail 12.14%  
Apple Mail 11.13%  
Apple Mail 4 7.98%  
Apple Mail 3 2.56%  
Apple Mail 2 0.59%  
Yahoo! Mail 9.54%  
Gmail 7.02%  
Windows Mail 1.84%  
Android 1.70%  
AOL 1.25%  
AOL Webmail 0.90%  
AOL Desktop 0.35%  
Thunderbird 1.21%  
Lotus Notes 0.20%  
Palm WebOS 0.07%  
Entourage 0.02%  
Unable to detect email client 10.22%  

Movers and shakers

The movers and shakers highlights those email clients whose market share is growing or shrinking the fastest. This is done by comparing the average usage between 2009 and 2011.

iOS Devices 84.23%
Gmail 22.29%
Apple Mail 14.97%
Thunderbird 10%
Lotus Notes -84.73%
Entourage -75%
AOL -36.86%
Yahoo! Mail -32.53%

See which email clients your subscribers are using

While this report provides a great overview of which email clients are popular, it's probably not a good representation of your own subscribers. To find out exactly what your subscribers are using, you should check out our email client reports.

The fine print

The email client a person is using can only be detected if images are displayed. This can give an inflated weighting to email clients that display images by default, such as Outlook 2000 and the iPhone. It will also provide a lesser weighting to those that block images by default such as Gmail and Outlook 2007. Those email clients that aren't capable of displaying images, such as older Blackberry models and other mobile devices cannot be included in this study.