Connie, the Active Directory integration details can be found in the SmarterMail online help, which can be found here: https://help.smartertools.com/SmarterMail/v16/Default.aspx?qq=%2fSmarterMail%2fv16%2fTopics%2fDomainAdmin%2fSettings%2fAdvanced%2fLDAPUsers.aspx As to your follow up questions; you can use AD authentication to authenticate within SmarterMail, and so this would synchronize the passwords in this case, as SmarterMail would default to AD for the authentication attempt. Any user account within SmarterMail can be configured to use an AD account for authentication, and these usernames can match or not. I hope that answers your questions. Have a great day!