Clear OWA and Outlook 2010/2013 Auto-Complete Cache

PowerShell

# Parameters

param (

[string]$EmailAddress,

[bool]$Impersonate = $false,

[bool]$UseAutodiscover = $true,

[bool]$UseDefaultCredentials = $true,

[bool]$TrustAllCertificates = $true,

[string] $Username,

[string] $Password,

[string] $Domain,

[string]$EwsUrl,

[string]$EWSManagedApiPath = "C:\Program Files (x86)\Microsoft\Exchange\Web Services\2.0\Microsoft.Exchange.WebServices.dll"

);

if ($TrustAllCertificates -eq $true)

{

## Code From https://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

write-host -ForegroundColor Yellow "Trusting all certificates!"

}

write-host "Accessing mailbox" $EmailAddress

# Loading ManagedAPI dll

[Void] [Reflection.Assembly]::LoadFile($EWSManagedApiPath)

# Setting up the service

$Service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2010_SP1);

# Setting up credentials

if ($UseDefaultCredentials -eq $true)

{

$Service.UseDefaultCredentials = $true;

}

else

{ 

$Service.Credentials = New-Object Microsoft.Exchange.WebServices.Data.WebCredentials($UserName, $Password, $Domain);

}

# Setting Autodiscover settings

if ($UseAutodiscover -eq $true)

{

$service.AutodiscoverUrl($EmailAddress, {$True});

}

else

{

$Service.Url = new-Object Uri($EwsUrl);

}

# If we are using impersonation then setup impersonation

if ($Impersonate)

{

$Service.ImpersonatedUserId = New-Object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress, $EmailAddress);

}

$PidTagRoamingBinary = New-Object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition(0x7C09, [Microsoft.Exchange.WebServices.Data.MapiPropertyType]::Binary)

$propertySet = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties, $PidTagRoamingBinary)

try

    {

#Get root folder

$folderid= new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$EmailAddress)

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

#Clear the outlook cache

$SearchFilterCollection = New-Object Microsoft.Exchange.WebServices.Data.SearchFilter+SearchFilterCollection([Microsoft.Exchange.WebServices.Data.LogicalOperator]::And)

$SearchFilter1 = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.ItemSchema]::ItemClass,"IPM.Configuration.Autocomplete")

$SearchFilterCollection.Add($SearchFilter1)

$itemView = new-object Microsoft.Exchange.WebServices.Data.ItemView(100)

$itemView.PropertySet = $propertySet

$itemView.Traversal = [Microsoft.Exchange.WebServices.Data.ItemTraversal]::Associated       

$findResults = $folder.FindItems($SearchFilterCollection,$itemView)

if ($findResults.Items.Count -ne 0)

        {

foreach($item in $findResults.Items)

           {

$item.Load($propertySet)

if($item.RemoveExtendedProperty($PidTagRoamingBinary))

                {

write-host "Cached deleted!"

$item.Update([Microsoft.Exchange.WebServices.Data.ConflictResolutionMode]::AlwaysOverwrite)   

                }

else

                {

write-host "No cache found!"

                }

            }

        }

#Clear the OWA Cache

$ContactsRootfolderID= new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Contacts,$EmailAddress)    

$ContactsRootfolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service,$ContactsRootfolderID)

$ContactsView = new-object Microsoft.Exchange.WebServices.Data.FolderView(5,0)

$Contactsview.PropertySet = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)

$findContactFolders = $ContactsRootfolder.FindFolders($Contactsview)

foreach ($Folder in $findContactFolders.folders)

              {

if($Folder.displayname -eq "Recipient Cache")

                     {

#Define ItemView to retrive just 1000 Items     

$ivItemView = New-Object Microsoft.Exchange.WebServices.Data.ItemView(10000) 

$ivItemView.PropertySet = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties)                          

$Cacheitmes = $service.FindItems($Folder.Id,$ivItemView)

$Cacheitmes

foreach($cachentry in $Cacheitmes.items)

                           {

$cachentry.Delete([Microsoft.Exchange.WebServices.Data.DeleteMode]::HardDelete)

                           }

                     }

              }

       }

catch

   {

#If the error is 'The specified object was not found in the store.' It means there are no entries in the Autocomplete cache. This error can be ignored       

if(!$error[0].ToString().contains("The specified object was not found in the store."))       

                {

write-host "`tfailed: $($EmailAddress) Error $($error[0])" -ForegroundColor Red

                }

   }