Email clients need to make sure that our email's HTML and CSS won't interfere with their own interface's HTML and CSS. A malicious email could use certain CSS properties (like absolute positioning) to lure people into clicking on overlaid hidden links.
According to email analytics tool Litmus, Outlook (on both Windows and macOS) accounted for 4.44% of email client market share in January 2022.
Since 2007, the Outlooks on Windows have used Word as the rendering engine for HTML and CSS. Microsoft justified the use of Word in 2009: We've made the decision to continue to use Word for creating e-mail messages because we believe it's the best e-mail authoring experience around, with rich tools that our Word customers have enjoyed for over 25 years.
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