A couple of handy PowerShell commands for exporting info from your AD:
All enabled users
Get-ADUser -Filter 'Enabled -eq $true' -Properties DisplayName, SamAccountName | Select-Object Name, DisplayName, SamAccountName | Export-Csv -Path "C:\temp\ActiveUsers.csv" -NoTypeInformation
Members of specific group
Get-ADGroupMember -Identity "<Group Name>" | Select-Object Name, SamAccountName | Export-Csv -Path "C:\temp\Members.csv" -NoTypeInformation
