Users / Group Migration from AD to Openldap

Hello,

Is there any way or tool which would be helpful in migrating AD users/groups to openldap ?

Current requirement and environment is as follows:

1. Active Directory on win2008

2. Users are authenticating from MAC and Windows clients against AD.

3. Access to ISILION storage is also using AD.

To replace Ad we are planning to go with RHEL6.X with openldap.

1. We need tools to migrate users/groups and schema from AD to openldap

2. Access to Samba share using opendap credentials. Here we are planning to use https://access.redhat.com/site/articles/17303

Note: The password sync will only be one sided, i.e. from Samba to LDAP.

Is there any way if user change password in ldap will sync to samba ?

Thanks in advanced

Regards,

Santosh