The “SendMessage” Step is a very valuable tool in notifying user of pending changes. However This doesn't seem to work on windows 8 machines.
For the messages to be displayed “KaUsrTsk.exe” must be running. However this process does not run when windows 8 is running in the “Metro” interface.
For the “SendMessage” to be displayed on the endpoint the “KaUsrTsk.exe” process must be running and Windows 8 must be at the desktop. The “SendMessage” is unable to be displayed over the metro interface.