The Wormhole wrote:
The Borg had transwarp at least ten years prior to Q Who, according to Voyager. Dark Fontier establishes this.
But even if we don't want to accept this, presumably they could have used one of those subspace corridor thingies from Descent. After all, it transported the Enterprise and Lore's Borg ship to the Delta Quadrant and back again.
Hang on, I thought that transwarp conduit only had a distance of 65 light years? At least that what Riker says.