mass password update

I need to do a complete password reset on an installation that's running encrypted passwords. Has anybody done this? What I'm wanting to do is to reset all the passwords to the same thing and then notify the members that they need to update their passwords.

Not to be arguing the point here, and I certainly thank you for your speedy reply, but this case isn't a normal forum. I didn't go into a lot of details, but this is a closed forum for a small organization. The only people who will have access to it are the members of that organzation. I did an import of the members, but I missed the point that, lacking a password field in the import table, the forum system would create and encrypt a password. I'd rather not run the import again, if I can avoid it. The mass password update I'd like to do would only serve as a temporary password until the members can log in and change it. The people that I've added through the import lack both username AND password. I massaged the data to give each a unique unsername, but it's not always perfectly obvious what that username would be for a given person. I know I could have them sign up for themselves and dodge the whole issue, but I'd rather not open the forum to signups at all since it's going to be for members of the organization only.

No, I don't think it would be easier, actually. I can do that, and I probably will end up doing that, but it would certainly take longer than an updater script that would take a generic password, get a new salt, create the encrypted password and update each account password and salt (I pulled code out of the registration update page). I took a stab at that already on my localhost, and it looks like it should work, but I must be missing something since login doesn't work. I spent a half hour on that, which would have been faster had I gotten it to wor. That didn't happen, so I think now I just have to muscle on and reset them all manually.

The perfect 5 minute fix! Thank you so much. I don't know why I didn't think of doing that, but there I went. Chasing off and over-complicating things. I'm really enjoying working with your forum system, and I really appreciate your help in this.