Which browsers/operating systems/platforms are used on Litmus?

Litmus runs its tests on whichever platform is most appropriate for a particular client. There are some exceptions, due to licensing constraints, where Litmus may use a slightly older or newer version of an operating system to offer better, cheaper and faster testing to our customers.

Microsoft Windows

The following clients run on Microsoft Windows 7 Professional:

  • Outlook 2000-2003
  • Outlook 2007
  • Outlook 2010
  • Outlook 2013
  • Thunderbird 31
  • All Lotus Notes clients

Mac OS 10.9 (Mavericks)

The following clients run on Mac OS 10.9:

  • Apple Mail 7

Mac OS 10.10 (Yosemite)

The following clients run on Mac OS 10.10:

  • Outlook 2011
  • Outlook 2016
  • Apple Mail 8

Web-based email

We open web-based email clients in the Windows versions of the following web browsers:

  • Internet Explorer 11
  • Firefox 45
  • Chrome 49


We currently use IMAP accounts within the Android apps.

  • The Android Gmail app is version 5.7.105901136 on Android 4.4.4
  • The default email app is version 4.4.4 on Android 4.4.4

Microsoft Outlook

Outlook decides which version of Internet Explorer to use based on the version that operating system has installed. The table below shows the version used by Litmus for each version of Outlook. Modern versions of Outlook (2007, 2010, 2013) use MS Word to render the emails, which differs from earlier versions. Outlook for Mac 2011 uses WebKit. Read more about Outlook rendering here.

Email Client Version Used
Outlook 2000 Internet Explorer 8
Outlook 2002 Internet Explorer 8
Outlook 2003 Internet Explorer 8
Outlook 2007 Word 2007
Outlook 2010 Word 2010
Outlook for Mac 2011 WebKit
Outlook 2013 Word 2013
Outlook for Mac 2015 WebKit

IBM Notes

Notes 8/8.5 selects its rendering engine from the operating system’s installed version of Explorer. Litmus uses Internet Explorer 8 on any machine running Lotus Notes 8/8.5.

Screen resolution

We currently use 1366×768 resolution. PC-based desktop/webmail client and browser previews are on machines using 96 DPI.

Mobile devices

The table below shows the mobile device and its operating system. We use the native mail application included for each mobile device.

Mobile Device Operating System
Samsung Galaxy Nexus Android 4.4.4 (KitKat)
iPhone 5S iOS 7 and iOS 8
iPad Retina iOS 9
iPad Mini iOS 9
iPhone 6 iOS 8
iPhone 6s iOS 9
iPhone 6 plus iOS 8
iPhone 6S plus iOS 9


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