Integrating ESXi host with AD will affect the legacy application services - will it involve Huge risk ?

Hi All,

We are planning to integrate the ESXi host with AD. There are 2 domain in our environment. Domain A ( legacy and its going to be retired soon) and Domain B.

All the like Biztalk, Astea, Mastermind,Citrix,goes on..which works on a two way interface, is it huge risk if we integrate ESXi host with AD with Domain B ? Even we have other option to integrate the host which is in Domain A with AD but still application team see a huge risk. Any pointers will be much appreciated for guiding in right direction. I'm ready to brief more on this if required

Thanks

V