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It seems like you're the big winner! High Sierra is a giant improvement to Sierra with all the same supported mac models, but improvements to Mail, Photos, Finder, and the Files System!
So they claim, but so far it breaks several apps I use on a daily basis. :(
 
Support for DisplayPort 1.2 daisy chaining. So you can hookup 2 displays with just 1 thunderbolt port being used.
 
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