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The Borg were a cybernetic, hive-mind collective in the mirror universe, much like their counterparts in the Prime universe.
History[]
Star Trek: New Empire[]
The Imperial Union of Planets sought for years to fashion mirror-equivalents of the Borg for servitude and soldiery. In 2385, Starfleet officers on the ISS Arcadia succeeded in creating Borg drones by obtaining Borg nanoprobe schematics from the Federation universe. These Borg soon ran amok and became a threat. Apparently, their threat was neutralized by 2386, though in what manner remains unclear.
Star Trek: Unity[]
The mirror universe Borg were a large group of cybernetically enhanced beings who helped their galaxy to overcome ecological problems. They were nowhere near as hostile as their primary universe counterparts.