You need to add an administrator in exchange 2010, this is not the same as 2003 /2007 where you do it in th EMC. You now need to this via active directory users and computers. This is useful for adding backup admins, powers and various other users to manage exchange 2010 tasks.
This used to be done by right clicking on the orginization and delegating rights to the user, not anymore.
Introducing…RBAC this is the new system for delegating rights in exchange. In simple terms though here is how to add an administrator.
1) In active directory you will now see an OU call “Microsoft Security Groups”.
CLICK IMAGES TO ZOOM
2) On the right hand side you will see “Orginization Management”, double click this and add the members who you would like to be admin.
The users are now Exchange Admin’s.