======Microsoft - Exchange - PowerShell - EWS - Notes======

=====Connect to an EWS that is using (self-signed) SSL=====
Using: 
<code>
[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {return $true}
</code>

Gives the error:
<code>
Exception calling "Bind" with "2" argument(s): "The request failed. The underlying connection was closed: An unexpected error occurred on a send."

At C:\Scripts\Create-Folders.ps1:18 char:1

+ $Inbox = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$folderid)

+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException

    + FullyQualifiedErrorId : ServiceRequestException

</code>

Solution: use the following code instead of ServerCertificateValidationCallback:
<code powershell>
## Choose to ignore any SSL Warning issues caused by Self Signed Certificates  
  
## Code From http://poshcode.org/624
## Create a compilation environment
$Provider=New-Object Microsoft.CSharp.CSharpCodeProvider
$Compiler=$Provider.CreateCompiler()
$Params=New-Object System.CodeDom.Compiler.CompilerParameters
$Params.GenerateExecutable=$False
$Params.GenerateInMemory=$True
$Params.IncludeDebugInformation=$False
$Params.ReferencedAssemblies.Add("System.DLL") | Out-Null

$TASource=@'
  namespace Local.ToolkitExtensions.Net.CertificatePolicy{
    public class TrustAll : System.Net.ICertificatePolicy {
      public TrustAll() { 
      }
      public bool CheckValidationResult(System.Net.ServicePoint sp,
        System.Security.Cryptography.X509Certificates.X509Certificate cert, 
        System.Net.WebRequest req, int problem) {
        return true;
      }
    }
  }
'@ 
$TAResults=$Provider.CompileAssemblyFromSource($Params,$TASource)
$TAAssembly=$TAResults.CompiledAssembly

## We now create an instance of the TrustAll and attach it to the ServicePointManager
$TrustAll=$TAAssembly.CreateInstance("Local.ToolkitExtensions.Net.CertificatePolicy.TrustAll")
[System.Net.ServicePointManager]::CertificatePolicy=$TrustAll

## end code from http://poshcode.org/624
</code>
[[https://social.msdn.microsoft.com/Forums/en-US/25d9fd46-ac8e-4411-adf5-8b8d8683d97c/ews-api-problem-connecting-inbox?forum=exchangesvrdevelopment|Microsoft Developer Network - Forum - EWS Api problem connecting Inbox]] \\