Working together to #MakeEmailBetter

Litmus + Microsoft Historic Partnership

See the exciting announcement from The Email Design Conference in Boston:

Litmus and Microsoft team up

Litmus and Microsoft are teaming up to make email better for thousands of email marketers—and the hundreds of millions of people who use Microsoft email products. Together we’ll prioritize known Microsoft email rendering bugs, identify issues faster, and announce improvements and fixes to the community. The email community will soon be able to participate in the world’s first email design feedback loop. Litmus will collect bug reports and rendering issues, which will be prioritized and reported directly to Microsoft engineers. In cooperation with Microsoft, we’ll work to fix bugs and announce their resolution to the community.

Rendering bugs feedback loop

The email community will soon be able to participate in the world’s first email design feedback loop. Litmus will collect bug reports and rendering issues, which will be prioritized and reported directly to Microsoft engineers. In cooperation with Microsoft, we’ll work to fix bugs and announce their resolution to the community.

Submit feedback and rendering bugs to outlook@litmus.com.

Coming soon for:


  • Outlook (WIN/OSX)
  • Outlook.com
  • Windows 10 Mail
  • Office 365
  • Outlook (iOS + Android)
  • Outlook (WIN 10 Mobile)

New Microsoft email clients coming soon for testing in Litmus

Microsoft is working with Litmus directly to provide access to even more of their email apps. And the best part? They’re available to all Litmus users at no cost.

Outlook iOS
Outlook Android
Outlook Windows Phone

Windows 10 Mail

Frequently Asked Questions

How does reporting an issue work?

Litmus is building a feedback mechanism directly inside its product. When viewing an Email Preview of an Outlook client, users will have the ability to submit a rendering issue. Litmus will forward the incident, including its screenshot and HTML source code, to the Outlook team. Until that feedback mechanism is launched, users can email outlook@litmus.com with rendering issues.

Is there a timeline on when issues will be fixed?

Outlook will review all issues and prioritize key issues. No timelines or public roadmaps will be available on what rendering changes are being worked on, but Litmus will be the first to communicate any such changes.

How will we find out about updates from Microsoft?

When any rendering change or update is made to Outlook email clients, Litmus will be the first ones notified and communicate such changes to the email community. Be sure to follow Litmus on Twitter and the Litmus blog.

How quickly will updated versions of Microsoft products be available in Litmus testing?

As a part of this partnership, Outlook and Litmus have a direct line of communication. Outlook engineers will be working with Litmus to ensure we have access to the most up-to-date Outlook email clients. If any updates to existing clients are made or new Outlook clients are launched, Litmus will provide access to the most popular versions of these email clients (based on usage).