Out of the box, Exchange 2010 comes with two primary tools for managing your environment – the Exchange Management Console (EMC) and the Exchange Management Shell (EMS). With just these two tools a good admin can do almost anything management asks of them 😉
The EMC is the GUI tool, which is great to get a quick idea of how a server is configured, how many Transport Rules you have, or do anything that only has to be done a handful of times.
The EMS on the other hand, is great for when you need to pull information from dozens, hundreds, or thousands of items. Imaging if someone asked you who has the largest mailbox in the environment. You could click through thousands of mailboxes in the EMC, or just run a quick cmdlet in the EMS and let PowerShell do the heavy lifting. The EMS also allows you to run more complex scripts that will make your life a lot easier.
With these two Exchange management tools, any Exchange admin can rule the world (of Exchange)!