Clear-Host
If (-not (Get-Module -Name 'ActiveDirectory' -ErrorAction SilentlyContinue)) {
Import-Module ActiveDirectory
}

# Get domain specific variables
$Domain = "contoso.com"
$DomainData = Get-ADDomain -Server $Domain
$DomainDistinguishedName = $DomainData.DistinguishedName
$DomainDNSRoot = $DomainData.DNSRoot
$DomainDC = $DomainData.PDCEmulator
$DomainNetBIOSName = $DomainData.NetBIOSName
$DomainNetlogonDir = "\" + $DomainNetBIOSName + "\NetLogon"
$AdminAccountsOU = "OU=Admins," + $DomainDistinguishedName
$DisabledAdminAccountsOU = "OU=Disabled," + $AdminAccountsOU
$ServiceAccountsOU = "OU=Service Accounts," + $DomainDistinguishedName

# Variable declaration
$ErrorActionPreference = 'Stop'
$WeekNumber = Get-Date -uformat %V
$ReportPath = "D:\Scripts\ICT-Administration\AD-SpecialAccounts-WeeklyReport"
$ReportName = "Week $WeekNumber - Weekly special accounts report - $DomainDNSRoot"
$ReportFile = $ReportPath + "" + $ReportName + ".html"

If ( -Not (Test-Path -Path $ReportPath)) {
New-Item -ItemType directory -Path $ReportPath
}

## Disabled admin accounts
$ReportDisabledAdminAccounts = @()
$DisabledAdminAccounts = @()
$DisabledAdminAccounts = Search-ADAccount -Server $DomainDC -AccountDisabled -SearchBase $AdminAccountsOU

ForEach ($DisabledAdminAccount in $DisabledAdminAccounts) {
$a1 = $null
$a1 = ((Get-ADUser -Server $DomainDC -Identity $DisabledAdminAccount -Properties LastLogonDate).LastLogonDate)
If ($a1) {
$a1 = ($a1).ToString("dd-MMM-yyyy")
} Else {
$a1 = ""
}

$b1 = $null
$b1 = ((Get-ADUser -Server $DomainDC -Identity $DisabledAdminAccount -Properties AccountExpirationDate).AccountExpirationDate)
If ($b1) {
$b1 = ($b1).ToString("dd-MMM-yyyy")
} Else {
$b1 = ""
}

$c1 = $null
$c1 = (Get-ADUser -Server $DomainDC -Identity $DisabledAdminAccount -Properties "msDS-UserPasswordExpiryTimeComputed" | `
Select-Object -Property @{Name = "ExpiryDate"; Expression = { [datetime]::FromFileTime($_."msDS-UserPasswordExpiryTimeComputed") } }).ExpiryDate
If ($c1) {
$c1 = ($c1).ToString("dd-MMM-yyyy")
} Else {
$c1 = ""
}

$d1 = $null
$d1 = ($DisabledAdminAccount.DistinguishedName).Split(",", 2)[1]

$e1 = $null
$e1 = (Get-ADUser -Server $DomainDC -Identity $DisabledAdminAccount -Property EmployeeID).EmployeeID

$ItemDisabledAdminAccounts = [PSCustomObject]@{
'Name'                     = $DisabledAdminAccount.Name
'Enabled'                  = $DisabledAdminAccount.Enabled
'Last Logon Date'          = $a1
'Account Expiration Date'  = $b1
'Password Expiration Date' = $c1
'Employee ID'              = $e1
'Account location'         = $d1
}
$ReportDisabledAdminAccounts += $ItemDisabledAdminAccounts
}

## Enabled admin accounts
$ReportEnabledAdminAccounts = @()
$EnabledAdminAccounts = @()
#$EnabledAdminAccounts += Get-ADUser -Server $DomainDC -SearchBase $AdminAccountsOU -Filter * -Properties * | Where-Object { $_.Enabled -eq $True -AND $_.Name -like "adm-*" }
$EnabledAdminAccounts += Get-ADUser -Server $DomainDC -SearchBase $AdminAccountsOU -Filter * -Properties * | Where-Object { $_.Enabled -eq $True }

ForEach ($EnabledAdminAccount in $EnabledAdminAccounts) {
$a1 = $null
$a1 = ((Get-ADUser -Server $DomainDC -Identity $EnabledAdminAccount -Properties LastLogonDate).LastLogonDate)
If ($a1) {
$a1 = ($a1).ToString("dd-MMM-yyyy")
} Else {
$a1 = ""
}

$b1 = $null
$b1 = ((Get-ADUser -Server $DomainDC -Identity $EnabledAdminAccount -Properties AccountExpirationDate).AccountExpirationDate)
If ($b1) {
$b1 = ($b1).ToString("dd-MMM-yyyy")
} Else {
$b1 = ""
}

$c1 = $null
$c1 = (Get-ADUser -Server $DomainDC -Identity $EnabledAdminAccount -Properties "msDS-UserPasswordExpiryTimeComputed" | `
Select-Object -Property @{Name = "ExpiryDate"; Expression = { [datetime]::FromFileTime($_."msDS-UserPasswordExpiryTimeComputed") } }).ExpiryDate
If ($c1) {
$c1 = ($c1).ToString("dd-MMM-yyyy")
} Else {
$c1 = ""
}

$ItemEnabledAdminAccounts = [PSCustomObject]@{
'Name'                     = $EnabledAdminAccount.Name
'Enabled'                  = $EnabledAdminAccount.Enabled
'Last Logon Date'          = $a1
'Account Expiration Date'  = $b1
'Password expired?'        = $EnabledAdminAccount.PasswordExpired
'Password Expiration Date' = $c1
'Password Never Expires'   = $EnabledAdminAccount.PasswordNeverExpires
'Employee ID'              = $EnabledAdminAccount.EmployeeID
'Account location'         = ($EnabledAdminAccount.DistinguishedName).Split(",", 2)[1]
}
$ReportEnabledAdminAccounts += $ItemEnabledAdminAccounts
}

## Service accounts
$ReportServiceAccounts = @()
#$AllServiceAccounts = Get-ADUser -Server $DomainDC -Filter { Name -like "svc*" -or Name -like "srvc*" } -Properties Name, Enabled, LastLogonDate, PasswordNeverExpires, DistinguishedName
$AllServiceAccounts = Get-ADUser -Server $DomainDC -SearchBase $ServiceAccountsOU -Filter * -Properties Name, Enabled, LastLogonDate, PasswordNeverExpires, DistinguishedName

ForEach ($ServiceAccount in $AllServiceAccounts) {
$a1 = $null
$a1 = ((Get-ADUser -Server $DomainDC -Identity $ServiceAccount -Properties LastLogonDate).LastLogonDate)
If ($a1) {
$a1 = ($a1).ToString("dd-MMM-yyyy")
} Else {
$a1 = ""
}

$ItemServiceAccounts = [PSCustomObject]@{
'Name'                   = $ServiceAccount.Name
'Enabled'                = $ServiceAccount.Enabled
'Last Logon Date'        = $a1
'Password Never Expires' = $ServiceAccount.PasswordNeverExpires
'Account location'       = ($ServiceAccount.DistinguishedName).Split(",", 2)[1]
}
$ReportServiceAccounts += $ItemServiceAccounts
}

## Computer accounts
$ReportComputerAccounts = @()
$AllComputerAccounts = Get-ADComputer -Server $DomainDC -Filter { Name -notlike "SS-DC*" } -Properties Name, Enabled, LastLogonDate, DistinguishedName

ForEach ($ComputerAccount in $AllComputerAccounts) {
$a1 = $null
$a1 = $ComputerAccount.LastLogonDate
If ($a1) {
$a1 = ($a1).ToString("dd-MMM-yyyy")
} Else {
$a1 = ""
}

$ItemComputerAccounts = [PSCustomObject]@{
'Name'             = $ComputerAccount.Name
'Enabled'          = $ComputerAccount.Enabled
'Last Logon Date'  = $a1
'Account location' = ($ComputerAccount.DistinguishedName).Split(",", 2)[1]
}
$ReportComputerAccounts += $ItemComputerAccounts
}

### Create report section : Build HTML report
$ReportHTML1 = $ReportDisabledAdminAccounts | Sort-Object 'Name' | ConvertTo-Html -Fragment -PreContent "<H2>Disabled admin accounts</H2>"
$ReportHTML2 = $ReportEnabledAdminAccounts | Sort-Object 'Name' | ConvertTo-Html -Fragment -PreContent "<H2>Enabled admin accounts</H2>"
$ReportHTML3 = $ReportServiceAccounts | Sort-Object 'Name' | ConvertTo-Html -Fragment -PreContent "<H2>Service accounts</H2>"
$ReportHTML4 = $ReportComputerAccounts | Sort-Object 'Name' | ConvertTo-Html -Fragment -PreContent "<H2>Computer accounts</H2>"

$Body = "
<!DOCTYPE html>
<html>
<head>

<style>
TABLE {<br />
    border-width: 1px;<br />
    border-style: solid;b<br />
    order-color: black;<br />
    border-collapse: collapse;<br />
    white-space:nowrap;<br />
}<br />
TH {<br />
    border-width: 1px;<br />
    padding: 4px;<br />
    border-style: solid;<br />
    border-color: black<br />
}<br />
TD {border-width: 1px;<br />
    padding: 2px 10px;<br />
    border-style: solid;<br />
    border-color: black;<br />
}<br />
TR:NTH-CHILD(odd) {<br />
    background-color:#eee;<br />
}<br />
TR:NTH-CHILD(even) {<br />
    background-color:#fff;<br />
}<br />
</style></head>
<body>
<H1>Week $WeekNumber - Weekly special accounts report - $DomainDNSRoot</H1>

$ReportHTML1

$ReportHTML2

$ReportHTML3

$ReportHTML4
</body>
</html>"

ConvertTo-Html -Title "Week $WeekNumber - Weekly special accounts report - $DomainDNSRoot" -Body $Body | Set-Content $ReportFile -Force
Start-Process -FilePath $ReportFile

# Mail report
$FromAddress = '<from email address'
$ToAddress = '<To email address 1>', '<To email address 2>'
$SMTPServer = '<SMTP sServer>'

$Subject = "Week $WeekNumber - Weekly special accounts report - $DomainDNSRoot"
Send-MailMessage `
-From $FromAddress `
-To $ToAddress `
-Subject $Subject `
-SmtpServer $SMTPServer `
-Attachments $ReportFile