Kalenderabfrage Gerätepostfach per Powershell

# Start Variablen -------------------------------------------------------------------------
# FQDN Exchange  Server 
$exserver = "ex.domain.tld"  
# E-Mail Adresse der Resource-Mailbox
$mailbox = "resourcemailbox@domain.tld"  
# Ende Variablen -------------------------------------------------------------------------

if ($PSVersionTable.PSVersion.Major -lt 3){write-host "ERROR: Minimum Powershell Version 3.0 is required!" -F Yellow; return}   

$ewspath = "$psscriptroot\Microsoft.Exchange.WebServices.dll"  
if (!(Test-Path $ewspath)){
    write-error "EWS DLL not found in script directory!"  
    return
}
# EWS DLL laden
Add-Type -Path $ewspath

# Allen Zertifikaten vertrauen
try{
Add-Type '  
    using System.Net;
    using System.Security.Cryptography.X509Certificates;
    public class TrustAllCertsPolicy : ICertificatePolicy {
        public bool CheckValidationResult(
            ServicePoint srvPoint, X509Certificate certificate,
            WebRequest request, int certificateProblem) {
            return true;
        }
    }
'  
}catch{}
# Trust all certs policy dem ServicePointManager zuweisen
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy

# EWS Objekt erstellen
$ews = new-object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2010)
$ews.UseDefaultCredentials = $true
$ews.Url = "https://$exserver/ews/exchange.asmx"  
$ews.ImpersonatedUserId = New-Object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress, $mailbox)

# -----------------------------
# Ergebnis Set-Einstellungen festlegen
$view = New-Object Microsoft.Exchange.WebServices.Data.ItemView(10000)
$view.PropertySet = New-Object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)
# Nur Meetings größer/gleich Heute
$filterStartDate = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+IsGreaterThanOrEqualTo([Microsoft.Exchange.WebServices.Data.AppointmentSchema]::Start,(get-date).Date)
# oder Meetings mit Enddatum größer Heute
$filterEndDate = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+IsGreaterThanOrEqualTo([Microsoft.Exchange.WebServices.Data.AppointmentSchema]::End,(get-date).Date)
# Die zwei Conditions zu einer FilterCollection hinzufügen
$filterCollection = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+SearchFilterCollection([Microsoft.Exchange.WebServices.Data.LogicalOperator]::Or,[Microsoft.Exchange.WebServices.Data.SearchFilter[]]($filterStartDate,$filterEndDate))
# Ergebnis Sortierung festlegen
$view.OrderBy.Add([Microsoft.Exchange.WebServices.Data.AppointmentSchema]::Start,[Microsoft.Exchange.WebServices.Data.SortDirection]::Descending)
# Kalender mit  Einstellungen durchsuchen
$result = $ews.FindItems([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Calendar,$filterCollection,$view)
# Gefundene Items im Kalender auflisten
$result.Items | select Subject,Start,End,Organizer,RequiredAttendees,OptionalAttendees | ft