Write-Verbose "Test-ExchangeMitigation: Start"

Write-Verbose "Test-ExchangeMitigation: Check URLSCan"
$error.clear()
$urlscaninstalled = Get-Item "HKLM:\SOFTWARE\Microsoft\IIS Extensions\URL Rewrite\" -ErrorAction SilentlyContinue
if (!$?) {
   "ERROR:URLRewrite Detection Failed"
}
elseif ($null -eq $urlscaninstalled) {
   "FAIL:IIS URLRewrite Not Installed"
}
elseif ($urlscaninstalled.getvalue("Install") -ne 1){
   "FAIL:IIS URLRewrite Not Installed"
}
Else {
   "OK:IIS URLRewriteInstalled"
}


Write-Verbose "Test-ExchangeMitigation: Check Mitigation Service"
$error.clear()
$mitigationservice = (Get-Service  MSExchangeMitigation -ErrorAction SilentlyContinue)
if (!$?) {
   "ERROR:Unable to geht Mitigation Service. not installed or no permission"
}
elseif ($mitigationservice.running -eq $true) {
   "FAIL:Mitigation Service not Running"
}
else{
   "OK:Mitigation Service Running"
}


Write-Verbose "Test-ExchangeMitigation: Check Service Running"
$error.clear()
$mitigationprocess = Get-Process "Microsoft.Exchange.Mitigation.Service" -errorAction Silentlycontinue
if (!$?) {
   "FAIL:Unable to get Mitigation Process in Tasklist - not running or no permission"
}
else {
   "OK: Microsoft.Exchange.Mitigation.Service running"
}


#Write-Verbose "Test-ExchangeMitigation: Check Eventlog last 5 Min "
#$error.clear()
#$mitigationlog = (Get-EventLog -LogName Application -Source "MSExchange Mitigation Service")


Write-Verbose "Test-ExchangeMitigation: Check Internet Access"
$error.clear()
[xml]$mitigationxml  = (Invoke-RestMethod https://officeclient.microsoft.com/getexchangemitigations)
if (!$?) {
   "ERROR: Unable to retrieve mitigations from microsoft. Check Internet access $($error)"
}
else {
   [long]$mitigationcount = $mitigationxml.EOCS.config.count
   if (!$?) {
      "ERROR: Unable to convert XML to uint mitigationcount"
   }
   else {
      "OK: Mitigation Count $($mitigationcount)"
   }
}

Write-Verbose "Test-ExchangeMitigation: ExchangeServerstatus"
$error.clear()
#
# Dieser Test funktioniert nur mit Exchange PowerShell
#(Get-ExchangeServer).MitigationsEnabled
#True

#$MitigationsApplied = (Get-ExchangeServer).MitigationsApplied.count
#1
#
#if ($mitigationcount -ne $MitigationsApplied){
#   "FAIL:Mitigationcount not match"
#}
#else {
#   "OK:Mitigationcount Match
#}


Write-Verbose "END Test-ExchangeMitigation"