I have 2 epo4.0 servers in my enviorment. I'm in the process of moving all the systems to 1 epo server. But I will be upgrading that server to 4.5 before that's completed. Will that cause a problem?
You should be OK. I have multiple servers on the same network. Just don' t import keys from one into the other. This keeps them separate.
No issues. Each agent has its own sitelist XML which specifies which server it will report to. This works with no issues I can think of.
No problem at all.
Just be sure to not update one epo server on the other, this could cause agent communication problems.