When Importing mass of users, it's not possible to review user mapping by hand.
Then it should provide a way to automap users based on strategies. The first strategy proposed is:
- If LDAP id exists => use found user
- Otherwise, if username match => use the found user (even if email differs)
- Otherwise create user (even if email is found)
This is intend to be used in environment where LDAP provides a strong consistency for ldapids and usernames (like ActiveDirectory)