Synchronizing Forced Password Changes?

aroobie asks: "I have several different types of servers running at my small office including Windows 2000 Advanced Server, VMS, IRIX, and Linux. My corporate parent wants to force passwords to change every 90 days, which is a good thing, but once a user changes his/her Windows password access to the other servers is denied until I make appropriate changes on the non-Windows servers. Sort of defeats the purpose of changing the password since each users has to give me their new password to make them match on on the servers. Has anyone found a way to synchronize passwords on different systems? Is there software available to do this?"