#* PROPERTY OF BRANT PUTTKAMMER, PLEASE CONTACT ME IF YOU HAVE QUESTIONS
#* PLEASE USE CAUTION WHEN RUNNING THIS PROGRAM ON YOUR SYSTEM

import-module ActiveDirectory;

$maxPasswordAgeTimeSpan = (Get-ADDefaultDomainPasswordPolicy).MaxPasswordAge

Get-ADUser -filter * -properties PasswordLastSet, PasswordExpired, PasswordNeverExpires, EmailAddress, GivenName, SamAccountName | foreach {

    $today=get-date
    $UserName=$_.GivenName
    $Email=$_.EmailAddress
    $DisplayName=$_.SamAccountName

    if (!$_.PasswordExpired -and !$_.PasswordNeverExpires) {

        $ExpiryDate=$_.PasswordLastSet + $maxPasswordAgeTimeSpan
        $DaysLeft=($ExpiryDate-$today).days
		
		if ($DaysLeft -eq 1){
		$DayText = "day"
		} elseif ($DaysLeft -eq 0) {
		$DayText = "days (less than 24 hours - change your password now!)"
		} else {
		$DayText = "days"
		}

        if ($DaysLeft -lt 7 -and $DaysLeft -ge 0){

        $WarnMsg = "
<p style='font-family:calibri;'>This is a friendly reminder $UserName,</p>
<p style='font-family:calibri;'><strong>Your Windows Password will expire in <span style='color:red;'>$DaysLeft $DayText</span> or exactly on $ExpiryDate!</strong></p>
<p style='font-family:calibri;'>To change the password, please follow the steps listed below:</p>

<ol style='font-family:calibri;'>
  <li>if you are currently logged on, close Outlook*</li>
  <li>press <em>CTRL + ALT + DEL</em></li>
  <li>select '<em>Change a password...</em>'</li>
  <li>click '<em>[DOMAIN-NAME]\$DisplayName</em>'</li>
  <li>enter your old password, then create and confirm a new password</li>
</ol>

<p style='font-family:calibri;'><em>* If you change your Windows Password during the day, email may be unavailable for 15 minutes. There is a sync delay between services. Simply close Outlook and then reopen after 15 minutes.</em></p>
<p style='font-family:calibri;'>If you have any questions about changing the password, please see your immediate supervisor.</p>

<p style='font-family:calibri;'>- System Administrators</p>

"
ForEach ($email in $_.EmailAddress) {
send-mailmessage -to $email -from 'distribution-group@domain.com' -cc user@domain.com -bcc user2@domain.com -Subject "Password Reminder: Your Windows Password will expire in $DaysLeft $DayText!" -body $WarnMsg  -smtpserver 192.168.0.0 -BodyAsHtml }

     }

    }
}