Activate all members in Buddypress

Hi guys. In my Buddypress website, how can I activate all members?
I have imported members from active directory, but if I go here: http://webservices.eui.eu/members/
I see only the ones who have login at least once. The only way is to list them alphatetically, and they have a status of "Never active".
Do you know how to bulk give them a last active date, in order to look active in the members page?
Thanks,
Francesco