General help

Hi all,

I just imported 2000+ users from a previous site to Moodle. Now, most of them are complaining that they are getting unwanted notifications of everything posted under Site News.

I don't know why/how they all got subscribed that way, and don't much care, but I would like to just unsubscribe them and stop answering so many complaints. There's too many to hope they'll realize they can unsubscribe themselves.

Is there a switch I can throw to set them all back to zero and let them re-subscribe at will?

TIA