Can Directory Opus 9 be installed on Windows Home Server 
The notes against the download say "self-installing executable containing the latest 32-bit version of Directory Opus (2000/XP/Vista)" which implies not, so I thought I would double check 
Yes, it should be fine. WHS is like Server 2003 which is like XP as far as almost all applications are concerned.
Unless WHS is a very weird version of Windows, at least... (e.g. One without a shell.) Can't say I've ever used it myself.
WHS is a development of Windows Server 2003. While I have not done so, I believe there should be no problems installing DOpus.