Over the last few months a great number of people have asked if we would be putting out a white paper on how to segregate address lists for Exchange 2003. We put a massive amount of time and effort into getting the Exchange 2007 version of this document ready and it is now released. There are no future plans to publish or create a 2003 version of this document.

There are a few things to note here:

1. If you are in need of address list segregation functionality, we highly recommend that you consider moving forward to Exchange 2007 to meet this need.
2. Microsoft never had produced a tested and supported solution for address list segregation, and that is why I wrote and fully tested with the development team the Exchange 2007 solution. The Microsoft Exchange product is an Enterprise Email solution and was never meant to be used for a hosting solution. This is why we created the HMC product. It is true that we did have some KB Articles and a hosting white paper at one time but they all have been pulled due to the number of service pack changes, hot fixes, security changes, etc. Over the last few years this support has been best effort, but due to the amount of problems that the documents have caused we will no longer provide that support.
3. All older Microsoft Exchange (Address List Segregation / Hosting KB Articles) have been pulled and are no longer valid.
4. All older Microsoft Exchange (Address List Segregation / White Papers, Technical Bulletins) have been pulled and are no longer valid.
5. All older Microsoft Exchange Hosting White Papers have been pulled and are no longer valid.
6. The only valid tested / approved Address List Segregation document is the Exchange 2007 address list segregation document that is now hosted on the Microsoft TechNet web site and is located here: http://technet.microsoft.com/en-us/library/bb936719.aspx

Outside using the Exchange HMC solution there will be no support for Exchange 2003 address list segregation. This is the official stance from The Exchange Product Group.

If you have questions about Exchange 2003 / 2007 co-existence for address list segregation then please the following blog post which contains a FAQ around Address List segregation (and I am updating it frequently):

http://blogs.msdn.com/dgoldman/archive/2008/02/17/exchange-2007-address-list-segregation-document-updates.aspx

Dave