Exchange 2010

What is:

Organization Configuration

Server Configuration

Recipient Configuration

and where do we create users and enable and disable and day-day work like in the AD users and computers in 2003

We have 2 HUB Transport servers and 4 mailbox servers with DAG. I want my helpdesk level 1 person not to be on every server but one where he can do day to day stuff.

Thanks

Thanks

Deep Kumar