Force a password change for a specific usergroup?

[Zith]

Hi,

We just did a medium sized import from UBB, about 1,500 users, and I would like to force a certain usergroup to have to reset their passwords (and not be able to use the same one again).

I realize that I can set vbulletin to require that every XX days, but I want to reset the PW's NOW, make people to it once, and leave those current pw's. There is concern of a PW leak from our old boards.

I don't want to reset everyone's pw, just a certain usergroup if possible, because we have a lot of inactive accounts that don't need it.

Tried searching and could not find much, if anyone could help out here would be great, thanks!

I take it there's no easy way to do this?