I've had phpbb2 running on my site for a while, and have just recently installed a Zen shop (still in maintenance mode). I chose to bridge the 2 applications during install, but to my understanding - this only works when a NEW user registers via the Zen signup page, specifies a username, and can then access phpBB.

What about all my current users? Is there a way I can merge their phpBB accounts with Zen?