To log on to a computer on the network, users need a user account and permission to access the computer. So after you create a user account, the next step is to allow access. From the server, open the Windows SBS console, click Users And Groups, and then follow these steps:
Click the Users tab and then double-click the user account.
On the Properties page, click Computers.
Select the computers that you want to allow this user account to access, and grant the user account the appropriate level of access.
If appropriate, select the Can Remotely Access This Computer check box. Click OK when finished.
You can always return to this page to change or update computer access for a user.