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I see how you can compose in multiple windows, but not how to read multiple messages in tabs, as pictured.
Personally, I think that's overloading the screen too much, and would rather just use browser-level tabs or windows. Just curious if/how it would work.
It's possible, open deep msg view (one more than convo view) by pressing 'enter' repeatedly or 'left-clicks' (as long as you don't have the preference "Double-click opens message in new window" selected) and the tabs are created automatically. Then rather than clicking close, navigate back to mail and open another.
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ZCS6 Tabbed Emails? 
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