Link: http://gsexdev.blogspot.com/2009/07/setting-single-line-view-in-owa-for.html

Early this year i posted a script for turning the reading pain off and on in OWA 2007 using some EWS proxy code in powershell. The same thing can also be done
using the EWS Managed API as well as other properties in OWA like the single line view which someone asked about this week. So here is a script that can be
used for setting both of these values.

Single Line View property,

Like the reading pain this OWA setting in controlled by a property that is set on each folder

http://schemas.microsoft.com/exchange/wcmultiline

To use this in Powershell in the EWS Managed API you need to define a Extended Property using the Public Strings PropertySet eg

$wcmultiline = New-Object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition [Microsoft.Exchange.WebServices.Data.DefaultExtendedPropertySet]::PublicStrings,”http://schemas.microsoft.com/exchange/wcmultiline”,
[Microsoft.Exchange.WebServices.Data.MapiPropertyType]::Boolean);

1 = True mean multiline view is On (Default)
0 = False meaning singleline view is enabled

If you wanted to set the reading pain the definition looks like

$rcReadingPain = New-Object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition([Microsoft.Exchange.WebServices.Data.DefaultExtendedPropertySet]::PublicStrings,”http://schemas.microsoft.com/exchange/preview”,
[Microsoft.Exchange.WebServices.Data.MapiPropertyType]::String);

0 – Preview Pane is off
1 – Preview Pane set to rights
2 – Preview Pane set to bottom

Using It If you haven’t used the EWS Managed API in powershell before take a look at this post first

I’ll show an example that uses delegate access to access another users mailbox and set this property. The first thing we will do is
create a variable to hold the email address of the mailbox you want to modify

$usertoSet = ”user@domain.com”

Next load the EWS Managed API dll and create a service object

$dllpath = ”C:\Program Files\Microsoft\Exchange\Web Services\1.0\Microsoft.Exchange.WebServices.dll”
[void][Reflection.Assembly]::LoadFile($dllpath)
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2007_SP1)

The script is going to use the current logged on user to find the CAS uri using autodiscover and connect to the mailbox of the user. If you want to specify a
specific CAS or user credential see the other post i reference to show what modifications need to be made to the script.

$windowsIdentity = [System.Security.Principal.WindowsIdentity]::GetCurrent()
$sidbind = ”LDAP://<SID=” + $windowsIdentity.user.Value.ToString() + ”>”
$aceuser = [ADSI]$sidbind

$service.AutodiscoverUrl($aceuser.mail.ToString())

Next Define the Folder to connect to using EWS delegate access

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

Define the Extendedproperty

$wcmultiline = New-Object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition([Microsoft.Exchange.WebServices.Data.DefaultExtendedPropertySet]::PublicStrings,”http://schemas.microsoft.com/exchange/wcmultiline”,
[Microsoft.Exchange.WebServices.Data.MapiPropertyType]::Boolean);

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

Add the Extended property setting the value to 0 which will enable single line view

$Folder.ExtendedProperties.Add($wcmultiline,”0”)

Call update which will commit the changes to the Folder

$Folder.update()

Pretty Easy right 😉

If you doing a lot of users put the code in a function and then call it from within a
get-mailbox loop using the email address.

If you wanted to set every Folder in the mailbox you need to loop through all folders thats pretty easy as
well using a Deep Traversal so i’ve put a sample of that as well as a simple inbox sample in the download which you can get from here