Old stuffs to new technology ... We know that it is not possible to change massively the password of the GroupWise users, versions 7 up to 2012, with ConsoleOne.
In those cases the old tool, written by Matt Weisberg, GroupWise Password Reset Utility (GWPR) can be very helpful.
Despite the fact that there is a utility with 10 years (last updated: May 26, 2004) the good news is that it can be used for GroupWise 2012 and Windows 7 workstations.