PS C:\Users\Administrator> import-module activedirectory PS C:\Users\Administrator> Get-ADUser -filter * -Properties GivenName,Surname,SamAccountName,EmailAddress | Select Given Name,Surname,SamAccountName,EmailAddress | Export-CSV c:\Windows\temp\userlist.csvThis results in a CSV with the first four fields populated. The CSV can be imported as is by adding five additional blank fields for a total of nine, or you can continue to build the data per Importing Your Users into JumpCloud.
Alternately, you can convert domain accounts to local accounts on Windows systems. ForensiT offers a free tool, User Profile Wizard, that can be used to convert AD user accounts to local user accounts. After the account is converted, JumpCloud can take over the user account on the system.
For more information see the following KB articles: