How can I tell if an admin is reading other people's email in Exchange 2010?

if you are using outlook you can read other ppls email by clicking

tools-> account settings
select your exchange account
change settings
more options
second tab contains add a mailbox
type the persons name in and add to your account
you can then see their mailbox in your outlook email.


to see if somebody is accessing other peoples email you can open the system manager on the mail server
drill down to mailboxes and there is a column LAST LOGGED IN BY

you would see his username there.