A nice Wiki i can say by @ovi
check it out. an official person from UiPath 
UiPath: Community vs Enterprise
CE is a fully functional edition of UiPath Platform. Because it’s free, there is no support for CE except for this Forum and it cannot be activated offline. Since there is no server integration, CE Robots can only be connected to Orchestrator CE2 - for evaluation and training purposes.
Regards…!!
Aksh
Anil_G
sharazkm32
ashokkarale
Yoichi
ppr
singh_sumit
sonaliaggarwal47
marco.roensch
Ragavi_Rajasekar
Lucky1