I put together a quick script to auto shutdown tagged ARM VMs.

There are many people still running ASM VMs and why wouldn’t you they are still supported (as of 9/2016).

The process is not much different and in fact now Azure Automation enables a RunAs account at set up its much easier to configure.

In the example below I have tacked on changes to the Azure Automation Team’s sample script, one of four created for you when you enable the feature.

<# .DESCRIPTION An example runbook which gets all the Classic VMs in a subscription using the Classic Run As Account (certificate) and then shuts down running VMs .NOTES AUTHOR: Azure Automation Team + Jonathan Wade LASTEDIT: 28-08-2016 #>

$ConnectionAssetName = "AzureClassicRunAsConnection"
$ServiceName = "wadeclassiv01"
	
# Get the connection
$connection = Get-AutomationConnection -Name $connectionAssetName        

# Authenticate to Azure with certificate
Write-Verbose "Get connection asset: $ConnectionAssetName" -Verbose
$Conn = Get-AutomationConnection -Name $ConnectionAssetName
if ($Conn -eq $null)
{
    throw "Could not retrieve connection asset: $ConnectionAssetName. Assure that this asset exists in the Automation account."
}

$CertificateAssetName = $Conn.CertificateAssetName
Write-Verbose "Getting the certificate: $CertificateAssetName" -Verbose
$AzureCert = Get-AutomationCertificate -Name $CertificateAssetName
if ($AzureCert -eq $null)
{
    throw "Could not retrieve certificate asset: $CertificateAssetName. Assure that this asset exists in the Automation account."
}

Write-Verbose "Authenticating to Azure with certificate." -Verbose
Set-AzureSubscription -SubscriptionName $Conn.SubscriptionName -SubscriptionId $Conn.SubscriptionID -Certificate $AzureCert 
Select-AzureSubscription -SubscriptionId $Conn.SubscriptionID

# Get cloud service
    
$VMs = Get-AzureVM -ServiceName $ServiceName

    # Stop each of the started VMs
    foreach ($VM in $VMs)
    {
		if ($VM.PowerState -eq "Stopped")
		{
			# The VM is already stopped, so send notice
			Write-Output ($VM.InstanceName + " is already stopped")
		}
		else
		{
			# The VM needs to be stopped
        	$StopRtn = Stop-AzureVM -Name $VM.Name -ServiceName $VM.ServiceName -Force -ErrorAction Continue

	        if ($StopRtn.OperationStatus -ne 'Succeeded')
	        {
				# The VM failed to stop, so send notice
                Write-Output ($VM.InstanceName + " failed to stop")
	        }
			else
			{
				# The VM stopped, so send notice
				Write-Output ($VM.InstanceName + " has been stopped")
			}
		}
    }

Disclaimer:  Please note although I work for Microsoft the information provided here does not represent an official Microsoft position and is provided as is.