Hello All: We have an AD 2003 / Exchange 2003 Forest we would like to migrate to AD 2008 / Exchange 2010. From reading kb articles, we need to have the Exchange Full Administrator Role to migrate mailboxes accross forrests. We would like to put both forrest domain admin groups in this role if possible, but there is only a SID that shows up when we run the Exchange Administration Delegation Wizard in the source 2003 domain. Unfortunately, we have searched through the 2003 AD and can not match that SID with an active user or group. ADSI Edit did not help either. Would this somehow hinder our process once we get started the migration? We have about 250 mailboxes to migrate accross the forrests. Any help and advice is greatly appreciated. Jeff T.

Do you have a full trust between the domains?Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

I agree with Ed and you should assure the forests are trusted to each other. To verify whether they are trusted, please refer to the link below: http://technet.microsoft.com/en-us/library/cc737447(WS.10).aspx If not, you can refer to the following article to create Forests trust. http://technet.microsoft.com/en-us/library/cc755700(WS.10).aspx Thanks. Novak Wu TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

How is thing going on? If there is any question, please feel free to post it here.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.