WSUS is a free tool from Microsoft that enables administrators to easily manage and deploy updates across the organization. WSUS is mainly used is enterprises with AD deployments, where the WSUS settings can be easily propagated to the workstations using group policy. So how does one keep their workstation/server updated without being part of the AD domain? You can do it by
1) Edit the local computer policy of the workstation/server by running “gpedit.msc”
2) Drill down to Computer Configuration -> Administrative Templates -> Windows Components -> Windows Update and change the settings for “Specify intranet Microsoft update service location“.
3) Restart the workstation.