After installing Microsoft Exchange Server 2010 you may access the Exchange Administration Center (EAC) using the https://localhost/ecp (from the server that is hosting the application) or https://<servername>/ecp (in this example it is https://exchange01.root.sysadmin.net/ecp).
1. Enter https://exchange01.root.sysadmin.net.ecp in the web browser url address bar. Click Continue to this website (not recommended).
2. Enter your authentication credentials then click Sign in.
3. Select the appropriate Language: and Time zone: settings then click OK.
4. Now you are logged in.
This completes the process to login to the Exchange Administration Center (EAC).