You can access InLoox address books via the tree structure on the left. Click on People in the tree structure and you will see all existing address books below:
Afterwards, click on an address book to open it.
Alternatively, you can access the address books via the ribbon. Therefore click on the InLoox now or InLoox PM tab and then on People. The InLoox address list will open. To open another address book click on Address Book in the Start tab and choose an address book from the drop-down-list.
Below you can see the address book view: