This is a Computer Group which contains all the computers that are discovered as a part of other Computer Groups defined in ManagementPack: Trend.Micro.ScanMail.for.Microsoft.Exchange
<ClassType ID="Trend.Micro.ScanMail.for.Microsoft.Exchange.BaseComputerGroup" Accessibility="Public" Abstract="false" Base="SC!Microsoft.SystemCenter.ComputerGroup" Hosted="false" Singleton="true"/>