In an age where copy and paste - and even drag and drop - work everywhere, it's unbelievable that data in this very popular application can't be copied.
I'm guessing that Microsoft's rationale was that you can easily compose a message to someone in the address book, so there'd be no need to access the email address that can be used with that silly SMTP protocol. But most Exchange servers do talk SMTP and interact on the global Internet. What if I need to give someone outside the company an email address they can use? Do I seriously have to type the address manually and hope I don't introduce any errors?