We have one AD domain, company.net
We currently have Exchange on-prem with company.net.
We have O365 with company.com as well.
I am looking at putting in a 2nd on-prem Exchange system with company.com (still suing the company.net AD) and doing hybrid to O365 for testing and then eventually moving the other on-prem exchange users to the new company.com on-prem Exchange.
Is there any issue in regards to running the 2 on-prem Exchange systems simultaneously?