EWS Create Mailbox folder Powershell module for Exchange and Office365 Mailboxes

This is a rollup post for a couple of scripts I've posted in the past for creating folders using EWS in an Exchange OnPremise or Exchange online Cloud mailbox. It can do the following

• Create a Folder in the Root of the Mailbox

Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test

• Create a Folder as a SubFolder of the Inbox

Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox'

• Create a Folder as a SubFolder of the Inbox using EWS Impersonation

Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox' -useImpersonation

• Create a new Contacts Folder as a SubFolder of the Mailboxes Contacts Folder

Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Contacts' -FolderClass IPF.Contact

• Create a new Calendar Folder as a SubFolder of the Mailboxes Calendar Folder

Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Calendar' -FolderClass IPF.Appointment

    The script will also detect if a folder with that name currently exists before trying to create a new folder.

I've put this module up on my github repo here you can download a copy here

The code looks like

function Connect-Exchange{ 
    param( 
     [Parameter(Position=0, Mandatory=$true)] [string]$MailboxName,
 [Parameter(Position=1, Mandatory=$true)] [System.Management.Automation.PSCredential]$Credentials
    )  
  Begin
   {
  Load-EWSManagedAPI
  
  ## Set Exchange Version  
  $ExchangeVersion = [Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2010_SP1
    
  ## Create Exchange Service Object  
  $service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService($ExchangeVersion)  
    
  ## Set Credentials to use two options are availible Option1 to use explict credentials or Option 2 use the Default (logged On) credentials  
    
  #Credentials Option 1 using UPN for the windows Account  
  #$psCred = Get-Credential  
  $creds = New-Object System.Net.NetworkCredential($Credentials.UserName.ToString(),$Credentials.GetNetworkCredential().password.ToString())  
  $service.Credentials = $creds      
  #Credentials Option 2  
  #service.UseDefaultCredentials = $true  
   #$service.TraceEnabled = $true
  ## Choose to ignore any SSL Warning issues caused by Self Signed Certificates  
    
  Handle-SSL 
    
  ## Set the URL of the CAS (Client Access Server) to use two options are availbe to use Autodiscover to find the CAS URL or Hardcode the CAS to use  
    
  #CAS URL Option 1 Autodiscover  
  $service.AutodiscoverUrl($MailboxName,{$true})  
  Write-host ("Using CAS Server : " + $Service.url)   
     
  #CAS URL Option 2 Hardcoded  
    
  #$uri=[system.URI] "https://casservername/ews/exchange.asmx"  
  #$service.Url = $uri    
    
  ## Optional section for Exchange Impersonation  
    
  #$service.ImpersonatedUserId = new-object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress, $MailboxName) 
  if(!$service.URL){
   throw "Error connecting to EWS"
  }
  else
  {  
   return $service
  }
 }
}

function Load-EWSManagedAPI{
    param( 
    )  
  Begin
 {
  ## Load Managed API dll  
  ###CHECK FOR EWS MANAGED API, IF PRESENT IMPORT THE HIGHEST VERSION EWS DLL, ELSE EXIT
  $EWSDLL = (($(Get-ItemProperty -ErrorAction SilentlyContinue -Path Registry::$(Get-ChildItem -ErrorAction SilentlyContinue -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Web Services'|Sort-Object Name -Descending| Select-Object -First 1 -ExpandProperty Name)).'Install Directory') + "Microsoft.Exchange.WebServices.dll")
  if (Test-Path $EWSDLL)
      {
      Import-Module $EWSDLL
      }
  else
      {
      "$(get-date -format yyyyMMddHHmmss):"
      "This script requires the EWS Managed API 1.2 or later."
      "Please download and install the current version of the EWS Managed API from"
      "http://go.microsoft.com/fwlink/?LinkId=255472"
      ""
      "Exiting Script."
      exit
      } 
   }
}

function Handle-SSL{
    param( 
    )  
  Begin
 {
  ## 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

 }
}

function Get-FolderFromPath{
 param (
         [Parameter(Position=0, Mandatory=$true)] [string]$FolderPath,
   [Parameter(Position=1, Mandatory=$true)] [string]$MailboxName,
   [Parameter(Position=2, Mandatory=$true)] [Microsoft.Exchange.WebServices.Data.ExchangeService]$service,
   [Parameter(Position=3, Mandatory=$false)] [Microsoft.Exchange.WebServices.Data.PropertySet]$PropertySet
    )
 process{
  ## Find and Bind to Folder based on Path  
  #Define the path to search should be seperated with \  
  #Bind to the MSGFolder Root  
  $folderid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::MsgFolderRoot,$MailboxName)   
  $tfTargetFolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$folderid)  
  #Split the Search path into an array  
  $fldArray = $FolderPath.Split("\") 
   #Loop through the Split Array and do a Search for each level of folder 
  for ($lint = 1; $lint -lt $fldArray.Length; $lint++) { 
         #Perform search based on the displayname of each folder level 
         $fvFolderView = new-object Microsoft.Exchange.WebServices.Data.FolderView(1) 
   if(![string]::IsNullOrEmpty($PropertySet)){
    $fvFolderView.PropertySet = $PropertySet
   }
         $SfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.FolderSchema]::DisplayName,$fldArray[$lint]) 
         $findFolderResults = $service.FindFolders($tfTargetFolder.Id,$SfSearchFilter,$fvFolderView) 
         if ($findFolderResults.TotalCount -gt 0){ 
             foreach($folder in $findFolderResults.Folders){ 
                 $tfTargetFolder = $folder                
             } 
         } 
         else{ 
             Write-host ("Error Folder Not Found check path and try again")  
             $tfTargetFolder = $null  
             break  
         }     
     }  
  if($tfTargetFolder -ne $null){
   return [Microsoft.Exchange.WebServices.Data.Folder]$tfTargetFolder
  }
  else{
   throw ("Folder Not found")
  }
 }
}


####################### 
<# 
.SYNOPSIS 
 Creates a Folder in a Mailbox using the  Exchange Web Services API 
 
.DESCRIPTION 
  Creates a Folder in a Mailbox using the  Exchange Web Services API 
  
  Requires the EWS Managed API from https://www.microsoft.com/en-us/download/details.aspx?id=42951

.EXAMPLE
 Example 1 To create a Folder named test in the Root of the Mailbox
  Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test
 
 Example 2 To create a Folder as a SubFolder of the Inbox
  Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox'
  
 Example 3 To create a new Folder Contacts SubFolder of the Contacts Folder
 Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Contacts' -FolderClass IPF.Contact
 
 Example 4 To create a new Folder using EWS Impersonation 
  Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox' -useImpersonation

#> 
########################
function Create-Folder{
    param( 
      [Parameter(Position=0, Mandatory=$true)] [string]$MailboxName,
  [Parameter(Position=1, Mandatory=$true)] [System.Management.Automation.PSCredential]$Credentials,
  [Parameter(Position=2, Mandatory=$true)] [String]$NewFolderName,
  [Parameter(Position=3, Mandatory=$false)] [String]$ParentFolder,
  [Parameter(Position=4, Mandatory=$false)] [String]$FolderClass,
  [Parameter(Position=5, Mandatory=$false)] [switch]$useImpersonation
    )  
  Begin
  {
  $service = Connect-Exchange -MailboxName $MailboxName -Credentials $Credentials
  if($useImpersonation.IsPresent){
   $service.ImpersonatedUserId = new-object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress, $MailboxName)
  }
  $NewFolder = new-object Microsoft.Exchange.WebServices.Data.Folder($service)  
  $NewFolder.DisplayName = $NewFolderName 
  if(([string]::IsNullOrEmpty($folderClass))){
   $NewFolder.FolderClass = "IPF.Note"
  }
  else{
   $NewFolder.FolderClass = $folderClass
  }
  $EWSParentFolder = $null
  if(([string]::IsNullOrEmpty($ParentFolder))){
   # Bind to the MsgFolderRoot folder  
   $folderid= new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::MsgFolderRoot,$MailboxName)   
   $EWSParentFolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$folderid)
  }
  else{
   $EWSParentFolder =  Get-FolderFromPath -MailboxName $MailboxName -service $service -FolderPath $ParentFolder
  }
  #Define Folder Veiw Really only want to return one object  
  $fvFolderView = new-object Microsoft.Exchange.WebServices.Data.FolderView(1)  
  #Define a Search folder that is going to do a search based on the DisplayName of the folder  
  $SfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.FolderSchema]::DisplayName,$NewFolderName)  
  #Do the Search  
  $findFolderResults = $service.FindFolders($EWSParentFolder.Id,$SfSearchFilter,$fvFolderView)  
  if ($findFolderResults.TotalCount -eq 0){  
      Write-host ("Folder Doesn't Exist")  
   $NewFolder.Save($EWSParentFolder.Id)  
   Write-host ("Folder Created")  
  }  
  else{  
      Write-error ("Folder already Exist with that Name")  
  }  
  
  
  }
}