We have been supporting another company that has usernames and emails outside of my company's standard. Recently we have purchased the company that we were supporting and they are looking to change their email addresses and usernames(loginid) at the same time. The LDAP servers will be changing as well so we will be able to stop the old ldap import but where the users are getting migrated to will be on the active LDAP import so we can only stop that for a short period of time.
Has anyone done a migration like this. If so, any best practices.