What is the best way to I import accounts from one domain to another

http://help.altn.com/mdaemon/en/active-directory_overview.htm Using the Active Directory options located at Accounts » Account Settings » Active Directory, MDaemon can be configured to monitor Active Directory and automatically create, edit, delete and disable MDaemon accounts when their associated accounts are altered in Active Directory. Further, it can also be set to keep all public contact records updated with the most recent information stored in Active Directory. Common fields like an account's postal address, phone numbers, business contact information, and so on can be populated into the public contact records and updated any time they are changed in Active Directory.