Finds Computer Accounts in AD that have not been logged into for a configurable amount of days (90 is the default, the default expiry time for Computer Accounts). The script will also automatically delete (or optionally disable) Workstation accounts to reduce AD clutter. It will not delete Server accounts or 'Unknown Accounts' (e.g. the AAD Conn…

Get-Inactive-Computers.ps1

#Import AD module - Installed as part of Windows Server Admin Tools
Import-Module ActiveDirectory

#Email settings

$To = @("IT Alerts <italerts@company.com>")

$Subject = "Inactive AD Computer Accounts"
$SmtpServer = "mail.company.com"
$From = "SCCM <SCCM@company.com>"


#Query AD Computers

$searchbase = "DC=ad,DC=company, DC=co, DC=uk"
$Days = (Get-Date).AddDays(-90)
$ADcomputers = Get-ADComputer -Properties *  -Filter {enabled -eq $true} -SearchBase $searchbase 


## Grab results as HTML tables

# Servers

$frag1 = $ADcomputers | Where {$_.OperatingSystem -Like “*server*” -and $_.lastLogonDate -lt $days} `
            | Select-Object Name, CanonicalName, OperatingSystem,OperatingSystemServicePack,whenCreated,LastLogonDate `
            | Sort-Object CanonicalName `
            | ConvertTo-Html -Fragment -PreContent ‘<h2>Inactive Servers (Verify and Remove Manually)</h2>’ `
            | Out-String
# Workstations
$frag2 = $ADcomputers | Where {($_.OperatingSystem -Like “Windows 7*” -or $_.OperatingSystem -Like “Windows 10*") -and $_.lastLogonDate -lt $days} `
            | Select-Object Name, CanonicalName, OperatingSystem,OperatingSystemServicePack,whenCreated,LastLogonDate `
            | Sort-Object CanonicalName `
            | ConvertTo-Html -Fragment -PreContent ‘<h2>Inactive Workstations (Automatically Disabled in AD)</h2>’ `
            | Out-String

# Other Systems

$frag3 = $ADcomputers | Where {$_.OperatingSystem -NotLike “Windows*” -and $_.lastLogonDate -lt $days} `
            | Select-Object Name, CanonicalName, OperatingSystem,OperatingSystemServicePack,whenCreated,LastLogonDate `
            | Sort-Object CanonicalName `
            | ConvertTo-Html -Fragment -PreContent ‘<h2>Inactive Other Systems (Verifty and Remove Manually)</h2>’ `
            | Out-String

# Remove / Disable Workstations

$RemovableADComputers = $ADcomputers | Where {($_.OperatingSystem -Like “Windows 7*” -or $_.OperatingSystem -Like “Windows 10*") -and $_.lastLogonDate -lt $days}

# Uncomment to disable rather than delete AD accounts
# $RemovableADComputers | Disable-ADAccount

$RemovableADComputers | Remove-ADObject -Recursive -Confirm:$false


$head = @"
<style>
TABLE {border-width: 1px; border-style: solid; border-color: black; border-collapse: collapse;}
TH {border-width: 1px; padding: 3px; border-style: solid; border-color: black; background-color: #6495ED;}
TD {border-width: 1px; padding: 3px; border-style: solid; border-color: black;}
</style>
"@


## Send via email 

$Splat = @{ 
    To         =$To 
    Body       ="$($InputObject | ConvertTo-HTML -head $head -PostContent $frag1,$frag2,$frag3 -PreContent “<h1>Inactive Active Directory Computer Accounts Report (Not logged in for 90 days)</h1>” )" 
    Subject    =$Subject 
    SmtpServer =$SmtpServer 
    From       =$From 
    BodyAsHtml =$True 
    } 
    Send-MailMessage @Splat 


# Uncomment to Export to CSV
#Export-CSV InactiveComputers.csv -NoTypeInformation -Encoding UTF8