You can disable password synchronization on a driver by setting theparameter to 0. Sometimes there is a need to have two Active Directory drivers enabled for one domain, but you only want one driver handling the password synchronization. Make sure that the parameter is set to 0 on the driver that does not synchronize passwords.
A use case for this is if one driver is synchronizing User objects and another driver is synchronizing Contacts. Contacts are displayed in the Exchange Global Address List (GAL), but they do not require an Active Directory license because they do not authenticate.