To join a computer running Windows Server 2008 as a member server to the Windows SBS network
1.Physically connect the computer running Windows Server 2008 to the Windows SBS network.
2.Log on to the computer that is running Windows Server 2008 by using the local administrator account.
3.Click Start, right-click Computer, and then click Properties. The System control panel appears.
4.Click Change settings.
5.If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
6.On the Computer Name tab, click Change.
7.Select Domain, type the name of your Windows SBS domain name, and then click OK.
8.Type the user name and password for the Windows SBS domain administrator account, and then click OK.
9.Click OK twice, and then click Close to save your settings.
Restart the server.
This will put the windows 2008 on the network.