Get an overview of all medium to critical risks for Windows 2008 / 2012:

Windows 2008:

sourcetype="tenable:sc:vuln" cpe:/o:microsoft:windows_server_2008  | table ip, netbiosName, dnsName, severity.name, pluginName, solution, description | join ip type=inner max=0 [ search index=main sourcetype="tenable:sc:vuln" baseScore>3  | table ip, netbiosName, dnsName, severity.name, pluginName, solution, description ] | sort by severity.name | chart count by severity.name

Windows 2012:

sourcetype="tenable:sc:vuln" cpe:/o:microsoft:windows_server_2012  | table ip, netbiosName, dnsName, severity.name, pluginName, solution, description | join ip type=inner max=0 [ search index=main sourcetype="tenable:sc:vuln" baseScore>3  | table ip, netbiosName, dnsName, severity.name, pluginName, solution, description ] | sort by severity.name | chart count by severity.name