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Configure the default calendar view in OWA in Exchange 2013 and Exchange Online using EWS and Powershell

If you are after a higher level of control over the default setting in OWA, EWS offers you the ability to configure many of the default setting by modifying the FAI (folder associated Item) configuration item that controls that setting. One example of a setting that you can modify is the default view of the calendar in OWA  eg  the following setting


When are user makes a change to this setting in OWA, the setting is stored in an FAI item with an Item Class of OWA.ViewStateConfiguration in a roaming dictionary property called CalendarViewTypeDesktop.

The values for each of the setting are

1 = Day
2 = Week
3 = Work week
4 = Month

The following script first checks to see if the OWA.ViewStateConfiguration config item exists (on a new mailbox if the user has never logged into OWA it probably wont exist).

To use this script you run it with the name of the Mailbox you want to run it against and the value for the enum you want to use eg to set the default as Work week use

./SetOWACalendarView.ps1 mailbox@domain.com 3

I've put a download of this script here

The code itself looks like

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## Get the Mailbox to Access from the 1st commandline argument
$MailboxName = $args[0]

$CalendarSetting = $args[1]

## 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
    } 
  
## Set Exchange Version  
$ExchangeVersion = [Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2013  
  
## 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  
$creds = New-Object System.Net.NetworkCredential($psCred.UserName.ToString(),$psCred.GetNetworkCredential().password.ToString())  
$service.Credentials = $creds      
#$service.TraceEnabled = $true
#Credentials Option 2  
#service.UseDefaultCredentials = $true  
  
## 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
  
## 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})  
"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) 

#Check for existing Item  
$folderid= new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Root,$MailboxName)     
$SfSearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.ItemSchema]::ItemClass,"IPM.Configuration.OWA.ViewStateConfiguration")  
$ivItemView =  New-Object Microsoft.Exchange.WebServices.Data.ItemView(1)  
$ivItemView.Traversal =  [Microsoft.Exchange.WebServices.Data.ItemTraversal]::Associated  
$fiResults = $service.FindItems($folderid,$SfSearchFilter,$ivItemView)  
if($fiResults.Items.Count -eq 0){  
    Write-Host ("No Config Item found, create new Item")  
    $UMConfig = New-Object Microsoft.Exchange.WebServices.Data.UserConfiguration -ArgumentList $service  
    $UMConfig.Save("OWA.ViewStateConfiguration",$folderid)  
}  
else{  
    Write-Host ("Existing Config Item Found");  
}  
#Specify the Root folder where the FAI Item is  
$UsrConfig = [Microsoft.Exchange.WebServices.Data.UserConfiguration]::Bind($service, "OWA.ViewStateConfiguration", $folderid, [Microsoft.Exchange.WebServices.Data.UserConfigurationProperties]::All)  
if($UsrConfig.Dictionary.ContainsKey("CalendarViewTypeDesktop")){  
    $UsrConfig.Dictionary["CalendarViewTypeDesktop"] = $CalendarSetting  
}  
else{  
    $UsrConfig.Dictionary.Add("CalendarViewTypeDesktop",$CalendarSetting)  
}
$UsrConfig.Update()  
"Mailbox Updated"
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All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.