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As we close the books on 2015, we thought it would be useful to share the evolution of email clients usage – based on data gathered from MessageFocus campaigns sent worldwide.

Spoiler alert: mobile email clients see another fantastic year of growth

We can’t delve into the specifics of the top 10 email clients without first drawing attention to the split between mobile, desktop and webmail clients. While webmail has seen quite stable usage, mobile increased by 13 percentage points. That’s a growth of 30% in just one year!

Email client split 2015

Outlook loses share to the Apple iOS, Gmail and Android increase as well

Comparing January and December email client usage, Outlook stands out with the most dramatic decrease in shares of 10 percentage points. After a few months of struggle, Outlook lost the top spot to iPhone in July 2015, and the second spot to iPad opens in December.

January 2015

  1. iPhone 21.3%
  2. iPad 16.5%
  3. Outlook 27%
  4. Gmail 9.7%
  5. Android 6.1%
  6. Apple Mail 6.3%
  7. Hotmail 4.3%
  8. Yahoo Mail! 3%
  9. Windows Live Mail 2.1%
  10. AOL 1.6%

December 2015

  1. iPhone 29.2%
  2. iPad 19.7%
  3. Outlook 16.7%
  4. Gmail 11.3%
  5. Android 8.4%
  6. Apple Mail 3.0%
  7. Hotmail 2.8%
  8. Yahoo Mail! 2.8%
  9. Windows Live Mail 2.0%
  10. AOL 2.1%

Meanwhile, Gmail and Android shares have been slowly creeping up – gaining a 25% increase in number of email opens.

The only way to know which email client you should optimize for is to have a look at your own reports. What does your top 10 look like?