All of us at ZPS-CNC USA handle the support and have since ZPS stopped supplying the machines to TREE. We have done everything we can to make the path for information and support simple, we even "bought" TREE's old phone number so end users wouldn't have to search us out. The 500, 750, 760, 840, 1050, 1050e, 1060, 1260, 1260e, 1680, 2080, and some of the knee mills are all still supported. Some of the early knee mill products are a bit sketchy but we do the best we can.

Rant on:
I've found over the years that the distributors seem to be the biggest issue with the support on the older machines. They will put fear into the end users that there is no more support, out of business, etc as a tactic to sell you their newest, latest and greatest equipment, I could cite examples until I'm blue in the face. I sleep very well at night knowing we don't use those tactics to sell our new machinery.
End rant.