It is shown on this page: http://support.microsoft.com/kb/884453, "How to install Small Business Server 2003 in an existing Active Directory domain". Is it possible to do this with SBS2008 ? If "YES", are there any published information about the procedure ?

Hi, Is this what you are looking for: http://technet.microsoft.com/en-us/library/dd334700%28WS.10%29.aspx -- Mike Burr

Yes, it is. Thank you very much. But there is something that confuses me - I want to migrate from Win2003Std to SBS2008. And also, I want to keep the existing Win2003Std as a second DC for a long time. But it is written in the shown article: ... After the migration is finished, you must remove the Source Server from the network within 21 days. ... Is this rule mandatory for the scenarios where the Source Server is Std, not SBS ? As I know, I can have more than one DC(Win2003Std/Win2008Std) together with SBS2003. But what about SBS2008 ?