you can have a blended system with legacy microinverters using the legacy Envoy and an IQ array using the IQ Envoy. 
They can both be added to your Enlighten site so that you have all of it in one view also. 
The legacy Envoy and inverters communicate on 144 khz frequency (in the U.S.) and 
the IQ material communicate on 110 khz frequency so there is no issues of interference, crosstalk, etc.