Set of scripts to query all domain controllers for the AD users LastLogon time and export the results to a CSV file. Useful for determining which accounts are active.

# import ActiveDirectory module
Import-Module ActiveDirectory

# load necessary functions
. .\Translate-ADName.ps1
. .\Get-ADUsersLastLogon.ps1

# get list of domain controllers
$domainControllers = (Get-ADForest).Domains | %{ Get-ADDomainController -Filter * -Server $_ }

# set CSV export path
$exportPath = 'c:\tmp\userlist.csv'

# get list of enabled users
$users = Get-ADUser -Filter 'enabled -eq $true' -Properties LastLogonDate, Enabled, EmployeeID

# create empty array
$userList = @()

# loop through the users and make our custom object
foreach ($user in $users) {
    
    $i++
    Write-Progress -activity "Querying domain controllers for $($user.SamAccountName) " -status "Percent complete $([decimal]::round(($i / $users.length)  * 100))" -PercentComplete (($i / $users.length)  * 100)
        
    $object = New-Object –TypeName PSObject
    $object | Add-Member -MemberType NoteProperty –Name 'Name' –Value $user.name
    $object | Add-Member -MemberType NoteProperty –Name 'EmployeeID' –Value $user.EmployeeID
    $object | Add-Member -MemberType NoteProperty –Name 'SamAccountName' –Value $user.SamAccountName
    $object | Add-Member -MemberType NoteProperty -Name 'LastLogon' –Value $(Get-ADUserLastLogon $user.SamAccountName $domainControllers)
    $object | Add-Member -MemberType NoteProperty -Name 'OU' –Value $($user.DistinguishedName | Translate-ADName canonical)
    $userList+=$object
}

# export the results to CSV
$userList | Export-Csv -NoTypeInformation -Path $exportPath -Force
function Get-ADUserLastLogon([string]$userName, $domainControllers) {
    
    $time = 0
    foreach($dc in $domainControllers) { 
        $user = Get-ADUser $userName -Server $dc.HostName -Properties LastLogon
        if($user.LastLogon -gt $time) {
            $time = $user.LastLogon
        }
    }
    $dt = [DateTime]::FromFileTime($time)
    return $dt
}

The script below was taken from WindowsITPro.

function Translate-ADName { 
<#
.SYNOPSIS
Translates Active Directory names between various formats.

.DESCRIPTION
Translates Active Directory names between various formats using the NameTranslate COM object. Before names can be translated, the NameTranslate object must first be initialized. The default initialization type is 'GC' (see the -InitType parameter). You can use the -Credential parameter to initialize the NameTranslate object using specific credentials.

.PARAMETER OutputType
The output name type, which must be one of the following:
  1779              RFC 1779; e.g., 'CN=Phineas Flynn,OU=Engineers,DC=fabrikam,DC=com'
  DN                short for 'distinguished name'; same as 1779
  canonical         canonical name; e.g., 'fabrikam.com/Engineers/Phineas Flynn'
  NT4               domain\username; e.g., 'fabrikam\pflynn'
  display           display name
  domainSimple      simple domain name format
  enterpriseSimple  simple enterprise name format
  GUID              GUID; e.g., '{95ee9fff-3436-11d1-b2b0-d15ae3ac8436}'
  UPN               user principal name; e.g., [email protected]'
  canonicalEx       extended canonical name format
  SPN               service principal name format

.PARAMETER Name
The name to translate. This parameter does not support wildcards.

.PARAMETER InputType
The input name type. Possible values are the same as -OutputType, with the following additions:
  unknown          unknown name format; the system will estimate the format
  SIDorSIDhistory  SDDL string for the SID or one from the object's SID history
The default value for this parameter is 'unknown'.

.PARAMETER InitType
The type of initialization to be performed, which must be one of the following:
  domain  Bind to the domain specified by the -InitName parameter
  server  Bind to the server specified by the -InitName parameter
  GC      Locate and bind to a global catalog
The default value for this parameter is 'GC'. When -InitType is not 'GC', you must also specify the -InitName parameter.

.PARAMETER InitName
When -InitType is 'domain' or 'server', this parameter specifies which domain or server to bind to. This parameter is ignored if -InitType is 'GC'.

.PARAMETER ChaseReferrals
This parameter specifies whether to chase referrals. (When a server determines that other servers hold relevant data, in part or as a whole, it may refer the client to another server to obtain the result. Referral chasing is the action taken by a client to contact the referred-to server to continue the directory search.)

.PARAMETER Credential
Uses the specified credentials when initializing the NameTranslate object.

.FUNCTIONALITY
Active Directory

.EXAMPLE
PS C:\> Translate-ADName -OutputType dn -Name fabrikam\pflynn
This command outputs the specified domain\username as a distinguished name.

PS C:\> Translate-ADName canonical 'CN=Phineas Flynn,OU=Engineers,DC=fabrikam,DC=com'
This command outputs the specified DN as a canonical name.

PS C:\> Translate-ADName dn fabrikam\pflynn -InitType server -InitName dc1
This command uses the server dc1 to translate the specified name.

PS C:\> Translate-ADName display fabrikam\pflynn -InitType domain -InitName fabrikam
This command uses the fabrikam domain to translate the specified name.

PS C:\> Translate-ADName dn 'fabrikam.com/Engineers/Phineas Flynn' -Credential (Get-Credential)
Prompts for credentials, then uses those credentials to translate the specified name.

PS C:\> Get-Content DNs.txt | Translate-ADName -OutputType display -InputType dn
Outputs the display names for each of the distinguished names in the file DNs.txt.

.NOTES
    http://windowsitpro.com/active-directory/translating-active-directory-object-names-between-formats
#>

[CmdletBinding()]
param(

  [parameter(Mandatory=$TRUE,Position=0)]
  [validateset("NT4","1779","SPN","canonical","GUID","DN","UPN","display","domainSimple","enterpriseSimple","canonicalEx")]
    [String] $OutputType,

  [parameter(Mandatory=$TRUE,Position=1,ValueFromPipeline=$TRUE)]
    [String[]] $Name,

  [validateset("NT4","1779","SPN","canonical","GUID","DN","UPN","display","domainSimple","enterpriseSimple","canonicalEx","SIDorSidHistory","unknown")] 
    [String] $InputType="unknown",

  [validateset("domain","server","GC")]
    [String] $InitType="GC",

    [String] $InitName="",

    [Switch] $ChaseReferrals,

    [System.Management.Automation.PSCredential] $Credential
)

    begin {

      # Hash table to simplify output type names and values
      $OutputNameTypes = @{
        "1779"             = 1;
        "DN"               = 1;
        "canonical"        = 2;
        "NT4"              = 3;
        "display"          = 4;
        "domainSimple"     = 5;
        "enterpriseSimple" = 6;
        "GUID"             = 7;
        "UPN"              = 9;
        "canonicalEx"      = 10;
        "SPN"              = 11;
      }

      # Copy output type hash table and add two additional types
      $InputNameTypes = $OutputNameTypes.Clone()
      $InputNameTypes.Add("unknown", 8)
      $InputNameTypes.Add("SIDorSidHistory", 12)

      # Same as with previous hash tables...
      $InitNameTypes = @{
        "domain" = 1;
        "server" = 2;
        "GC"     = 3;
      }

      # Accessor functions to simplify calls to NameTranslate
      function invoke-method([__ComObject] $object, [String] $method, $parameters) {
        $output = $object.GetType().InvokeMember($method, "InvokeMethod", $NULL, $object, $parameters)
        if ( $output ) { $output }
      }
      function get-property([__ComObject] $object, [String] $property) {
        $object.GetType().InvokeMember($property, "GetProperty", $NULL, $object, $NULL)
      }
      function set-property([__ComObject] $object, [String] $property, $parameters) {
        [Void] $object.GetType().InvokeMember($property, "SetProperty", $NULL, $object, $parameters)
      }

      # Create the NameTranslate COM object
      $NameTranslate = new-object -comobject NameTranslate

      # If -Credential, use InitEx to initialize it; otherwise, use Init
      if ( $Credential ) {
        $networkCredential = $Credential.GetNetworkCredential()
        try {
          invoke-method $NameTranslate "InitEx" (
            $InitNameTypes[$InitType],
            $InitName,
            $networkCredential.UserName,
            $networkCredential.Domain,
            $networkCredential.Password
          )
        }
        catch [System.Management.Automation.MethodInvocationException] {
          write-error $_
          exit
        }
        finally {
          remove-variable networkCredential
        }
      }
      else {
        try {
          invoke-method $NameTranslate "Init" (
            $InitNameTypes[$InitType],
            $InitName
          )
        }
        catch [System.Management.Automation.MethodInvocationException] {
          write-error $_
          exit
        }
      }

      # If -ChaseReferrals, set the object's ChaseReferral property to 0x60
      if ( $ChaseReferrals ) {
        set-property $NameTranslate "ChaseReferral" (0x60)
      }

      # The NameTranslate object's Set method specifies the name to translate and
      # its input format, and the Get method returns the name in the output format
      function translate-adname2([String] $name, [Int] $inputType, [Int] $outputType) {
        try {
          invoke-method $NameTranslate "Set" ($inputType, $name)
          invoke-method $NameTranslate "Get" ($outputType)
        }
        catch [System.Management.Automation.MethodInvocationException] {
          write-error "'$name' - $($_.Exception.InnerException.Message)"
        }
      }
    }

    process {
      Foreach($item in $name){
        translate-adname2 $name $InputNameTypes[$InputType] $OutputNameTypes[$OutputType]
      }
    }
 }