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You do need a new 10 speed shifters because the old one isn't compatible (old have same cable pull as old road 10 speed groupset)
But if you ride with a single chainring, it's possible to run 11-42 on older derailleur.
Actually I'm going to do just that on my Elephants with the long cage deore derailleur.
Shimano tech name for the newer 10 speed MTB groupset, basically to improve drivetrain effectively.