Migrating User Accounts
Clearly, migrating user accounts is one of the core elements of domain migration, and the process takes several steps. First, the new user object must be created within the destination domain. Only then can properties of the user objects be transferred (because you cannot reference a property on an object prior to the object existing in the directory).
Before migrating user accounts, you should consider whether you must migrate passwords for the accounts. If you do, you should perform the password migration steps first, and then perform the user account migration.
An important contingency in a migration of user accounts is whether to migrate the SIDs for the user accounts to the destination domain (which creates or updates ...