Presently we are using PADS ES Suite (PADS VX2.1), netlist flow for our multilayered designs. But now a days as most of the designs have a requirement of Backdrilling and Antipads, PADS ES suite does not have any feature to incorporate this. PADS Pro has the feature of Backdrilling and Route Keepout Addition(Antipad).
I need to know
a) the compatibility w.r.t PADS ES Suite in terms of Library, and Legacy designs
b) Efforts required for the upgrade to PADS pro
c) Integrated Vs Netlist flow