Next up is transfering the global catalog server
The global catalog is the central information store of the domain – http://www.tech-faq.com/the-global-catalog-server.html . Remember in SBS the SBS box has to hold the FSMO roles as well as be the global catalog server. In the last step we moved the FSMO roles
Transfer the global catalog to the Destination Server
To ensure that the Destination Server is the global catalog for the network, transfer the global catalog from the Source Server.
To create a new global catalog on the Destination Server
1. On the Destination Server, click Start, point to Administrative Tools, and then click Active Directory Sites and Services.
2. In the Active Directory Sites and Services console tree, double-click Sites, and then double-click <sitename> (where <sitename> is the name of the site that will serve as the global catalog).
Which in a SBS domain is probably going to be Default-First-Site-Name
3. Expand the Servers folder, click the name of the Destination Server, right-click NTDS Settings, and then click Properties.
4. On the General tab, select the Global catalog option if it is not already selected, and then click OK.
(we don’t because it’s already a global catalog)
Allow sufficient time for the account and the schema information to replicate to the Destination Server before you remove the global catalog from the Source Server.
Event 1119 may be logged in the Directory Services log in Event Viewer stating that the Destination Server is now advertising itself as a global catalog server.