Thank you, Sundar.
i) I am running WSS 3.0 side-by-side on SBS.
ii) I searched this forum and read the SharePoint Server 2007 on SBS
thread, but it was not quite relevant to my concern, which is Office Forms
Server on SBS, not SharePoint Server on SBS.
iii) The Microsoft link for supported OSes was, perhaps, the most useful
because it did not explicitely list SBS.
HOWEVER!!!!
Microsoft Pre-sales says there is no technical reason Forms Server shouldn't
run on SBS because SBS comes with Windows Server 2003. However, upon
consultation with somebody, the pre-sales fella said that although it should
run, Microsoft would not provide technical support for it.