It's a MacOS Sierra thing. Open `preferences > Dock > Prefer tabs when opening documents:` and choose what you want. In my case, I have it set to always and that way, MM will open a message in a tab, same goes for compose window etc.

Cheers,
Pedro

On 1 May 2017, at 20:29, Aaron Falk wrote:

Is there some magic needed to get a message to open in a new tab instead of a new window?

—aaron
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