When addressing an email in OWA, I only see people from my own Contacts folder. However, I have plenty more Contacts in another folder and of course there is the Global Address List of our company with all the internal contacts.

The Contacts folder of my colleague is empty so opening the Address Book is currently completely useless to him.

How can I switch between all the address lists in my Address Book?
Is there also a way to change the default like you could in previous versions of OWA and within Outlook itself?