Hi,I was going through this below link for upgrading.http://technet.microsoft.com/en-us/library/bb681052.aspxI am not sure how to do the 3rd point. It says detach the child sites from the SMS 2003 site and attach them to the new configuration manager primary site.Does it mean that I have to delete the address and sender from SMS 2003 and add it to SCCM 2007 site server?

Hi,Don't delete the addresses, they can still exists even if the parent/child relationship is broken. On the new configmgr server you need to create the addresses to the child sites.Kent Agerlund | http://scug.dk/members/Agerlund/default.aspx | The Danish community for System Center products