This content is no longer actively maintained. It is provided as is, for anyone who may still be using these technologies, with no warranties or claims of accuracy with regard to the most recent product version or service release.
The ExternalSourceType property indicates the nature of the source of the message. Valid if the message arrived from the external network. Valid on Internal servers only.
Redistributable: Requires Microsoft Office Communications Server 2007
Assembly: ServerAgent (in ServerAgent.dll)