Back on Wednesday, [January 06, 2010] I published the following blog: Exchange 2010 Address List Segregation – Update. In this blog I made the following statement: "I think you will be happy to know that I am towards the end of wrapping up the Exchange 2010 Address List Segregation white paper. I will post another update as soon as we are finished with the editing and when it will be posted.". After working with development we agreed to post this blog to state a few things:
I need to mention the support stances here.
“It is also important to understand that any attempt to use this whitepaper to configure Exchange 2007 for a commercial "hosting" solution is not supported. This whitepaper is not a replacement for the Microsoft HMC (Hosting and Collaboration) software. The information that is provided in this whitepaper is meant for internal segregation use only.”
If you are planning on using Exchange 2010 and you currently have Exchange 2007 using Address List segregation *YOU MUST* remove all address list segregation from your organization to avoid running into the bug that we are currently working on at this time. PLEASE HEED THIS WARNING!!
In order to revert your organization back to a default exchange installation permission set you can follow this blog: http://blogs.msdn.com/dgoldman/archive/2007/05/16/missing-permissions-on-the-address-lists-container-breaks-the-oab-generation-process.aspx and http://blogs.msdn.com/dgoldman/archive/2008/04/03/how-to-prepare-your-organization-for-exchange-2007-address-list-segregation.aspx
I mentioned that I would speak about the nature of this problem. Due to the architectural changes in Exchange 2010, Address Book queries are performed in a different way than we did in prior versions of Exchange. I am not going to explain this in full, however you can view this blog for those new component changes: http://blogs.msdn.com/dgoldman/archive/2010/03/15/exchange-2010-address-list-segregation-update.aspx
The problem that I ran in to was that if you already had the deny permission set on the default global address list from using the 2007 Address List segregation white paper and you have installed Exchange 2010 the exchange server will not have the ability to read the default global address list. At this point the default global address list object would be removed from all of the objects showInAddressList attribute. Here is what happens once this occurs:
Your only option to fix this
WARNING: In the event that this does not fix it for any objects in your organization this becomes a manual fix from here. You will need to look up the object that is still having a problem using ADSIEdit.msc and look at the showInAddressList attribute. You will need to add the legacyExchangeDN for the default global address list and this will fix the problem for that object.
NOTICE: This blog has been approved by the Microsoft Exchange Product Group.
Im a little confused. Will there be support for address list segregation when your whitepaper is released, for a mixed Exchange 2007 and 2010 org? We currently are running Exchange 2007 with address list segregation and want to transition to Exchange 2010 again using address list segregation.
Yes it will be supported when the white paper is released, however it will not be if you are in mixed mode due to the changes in exchange 2010.
Just to be clear - So we wont be supported if we implement the changes in your whitepaper when we are running in mixed mode?
Just so we are clear.
Question: Will it be supported *if and when* the white paper is release?
Answer: Yes, *if and when* the white paper is released.