The official Sierra game servers were shut down on 1st November 2008.
On June 25, 2004, Vivendi made Ground Control a free download (460MB) in order to promote the release of Ground Control 2. Download it here.
One of the main characters in Ground Control is a one Major Tom. Could this be a reference to David Bowie's "Space Oddity"?
"This is Ground Control to Major Tom..."
The Ground Control training session voice, as well as the Crayven Corporation field voice is supplied by Heidi Ernest, the same voice as Homeworld's Karan Sjet, the Mothership.