We have multiple domains in our company. For various reasons, we cannot merge these domains into a single domain. They must all remain separate and ideally without trust relationships. That being said, we have some users who must log into each of these domains at various times. To reduce the password memorization burden on the users, I'd like to synchronize their passwords between the same users on different domains. What sort of options do I have as far as methods to synchronize user accounts between the domains? I'm okay using 3rd party tools or Microsoft options, as long as the method of choice can be scheduled and automated. Any suggestions would be welcomed.