Prerequisites:

The following solution should be built on a development machine with: 

a) Visual Studio 2005 and BizTalk 2006 installed.

Extract Immutable_To_Mutable.zip to the root of the C:\ drive

The following folders should be created:

C:\Immutable_To_Mutable\BTS_Immutable_To_Mutable
C:\Immutable_To_Mutable\Class_Immutable_To_Mutable
C:\Immutable_To_Mutable\Files

Install and run the sample
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1) Navigate to folder:
C:\Immutable_To_Mutable

Open Visual Studio Solution:
Immutable_To_Mutable.sln

For the BTS_Immutable_To_Mutable BizTalk project, 
check Deployment property page for correct Server and Configuration Database
(Right mouse button on the BTS_Immutable_To_Mutable project in Visual Studio and 
choose Properties in the pop up menu. In the dialog choose -> Configuration Properties -> Deployment)


2) Deploy

In Visual Studio right mouse button on Solution 'Immutable_To_Mutable' 
and in the popup menu choose -> Deploy

This will build both projects in the solution,deploy the BTS_Immutable_To_Mutable BizTalk project and 
GAC the C# class project -> Class_Immutable_To_Mutable.

Using the BizTalk 2006 Administration console, ensure that an Application called 
Immutable_To_Mutable was created.

3) Import the Binding file and Start Application

Using the BizTalk 2006 Administration console, navigate to the 
Immutable_To_Mutable application. Right mouse button on the 
Immutable_To_Mutable application and in the popup menu choose:
Import -> Bindings

In the Import Bindings Dialog box, navigate to folder:
C:\Immutable_To_Mutable

and then choose file:
Bindings.xml

Right mouse button on the Immutable_To_Mutable application and choose 
Start in the popup menu to start the application.

4) Test

Navigate to folder:
C:\Immutable_To_Mutable\Files

Copy file:
PO.xml

To folder:
C:\Immutable_To_Mutable\Files\ReceivePO

Navigate to Folder:
C:\Immutable_To_Mutable\Files\Send

The resultant Invoice xml file should be dropped to the above folder

To determine how things work, please examine the two Visual Studio projects and visit:
http://objectsharp.com/cs/blogs/matt/archive/2007/04/02/turning-an-immutable-message-in-biztalk-into-a-mutable-message.aspx