Our report on the top 10 email clients in use for September 2008.
This report shows the current state of the email client market. It serves as the largest ever study of its kind, with data from almost three million email recipients. To run an analysis like this on your own mailing list, look at our Fingerprint service.
See below for caveats and licensing.
We run Fingerprint and Litmus. Litmus lets you easily test your email campaigns across all popular email clients and spam filters, ensuring your messages look great and get delivered every time. More about Litmus...
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| Email client | Market share | |
|---|---|---|
|
Outlook Outlook 2003 and earlier Outlook 2007 |
36% 29% 7% |
|
| Hotmail | 33% | |
| Yahoo! Mail | 14% | |
| Gmail | 6% | |
| Apple Mail | 4% | |
| Windows Live Mail (Desktop) | 3% | |
| Thunderbird | 2.4% | |
| iPhone | 1.3% | |
| Lotus Notes | 0.2% | |
| AOL Mail | 0.1% | |
Data collected from 982,873 email recipients using our Fingerprint analysis tool. The mailing list owners classified their mailing list as mainly business users. This chart shows the top 10 email clients by market share. Compiled 11 September 2008 (revised 15 September 2008).

| Email client | Market share | |
|---|---|---|
| Yahoo! Mail | 29% | |
|
Outlook Outlook 2003 and earlier Outlook 2007 |
27% 14% 13% |
|
| Hotmail | 25% | |
| Apple Mail | 4% | |
| Gmail | 4% | |
| Comcast | 3% | |
| AOL Mail | 3% | |
| Thunderbird | 2% | |
| Windows Live Mail (Desktop) | 2% | |
| iPhone | 1% | |
Data collected from 1,963,046 email recipients using our Fingerprint analysis tool. The mailing list owners classified their mailing list as mainly consumer users. This chart shows the top 10 email clients by market share. Compiled 11 September 2008 (revised 15 September 2008).

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Email clients are recorded when images are loaded within an email. Some email clients block external images, or are not capable of displaying HTML email. That includes non-current models of Blackberry, and other mobile devices unable to view HTML email. As a result these are not tracked and do not appear in the report.
Further to that, the report only shows the top 10 email clients we have detected. In total we can detect over 3,000 different clients. Because of this diversity we recommend analysing your own mailing lists to gain the most accurate information, since results can vary greatly depending on your lists' demographics.
We realise you may like to republish this data in reports for your clients or colleagues. You can do so, as long as it's on a non-commercial basis, and you link back to this page. You may not charge for this data. If you'd like to use it commercially, please contact us.
The Email Client Statistics Data is licensed by Fingerprint under a Creative Commons Attribution-Non-Commercial-Share Alike 2.0 License.