I am using the GroupWise driver within a solution where there is the
concept of internal and external users. For internal users the driver
needs to create a mailbox which I believe is standard functionality within
the driver.

For external users the requirement is for an entry to be added to the
global address book. The user does not however need a mailbox. Is this
possible or is there some work around to achieve the goal of an entry
being created within the address book?