By default SkySync uses the email attribute to find and match user; if the email field is blank in active directory then SkySync will ignore the user

Server Name: This is a required field and can be the DNS name or IP address of your Active Directory

Distinguished Name:This is the location within AD from where you want to search for users

Example: OU=PortalarkEmployees, DC=poratlark, DC=loc
- OU = Organizational units
- DC= domain controller (for each dot you need additional DC)
- You do not need this if you are using DNS name for the server name rather than the IP Address (default should be good)
- You can have multiple OUs, they can be comma separated. Think of them as folders.

The link to MSDN (https://msdn.microsoft.com/en-us/library/aa746475(v=vs.85).aspx) has examples and the operators; this is more for an active directory administrator.