http://developers.de/blogs/damir_dobric/archive/2010/12/14/how-to-obtain-a-host-instance-within-a-workflow-service.aspxThe Workflow Foundation programming model introduces a Workflow Service as a way to build a reach and robust long running composite applications. This model does not allow one to access the host. Unfortunately, sometimes it is required to access the hostenCommunityServer 2008 SP1 (Build: 30619.63)