Who has an ATP License assignment in your tenant and who does not?
I have developed a script to check for who has a ATP license assigned and who does not in your tenant.
What you will need to do is connect PowerShell to O365 and run the following.
O365 PowerShell connection information:
https://technet.microsoft.com/en-us/library/jj984289(v=exchg.160).aspx
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$PIUsers = Get-MsolUser -All | Where { ($_.isLicensed -eq $True) } | Select UserPrincipalName,Licenses
ForEach ($User in $PIUsers) { ForEach ($License in $User.Licenses) { ForEach ($Service in $License.ServiceStatus) { If ($Service.ServicePlan.ServiceName -like 'ATP_ENTERPRISE') { $User.UserPrincipalName}}}}
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Once completed the users that have the license assigned will be displayed in the output on screen and the transcript will output the results to a text file.