Sales guys, more details if you sell to governments.
Stop the FUD, let them know we are approved!
Technote is here
Federal Desktop Core Configuration (FDCC) on Windows® XP and Vista is a mandate issued by the U.S. Federal Government. The most current versions (and future versions) of IBM® software products that are deployed by U.S. government agencies need to be able to install and run on Windows XP Professional and Windows Vista Enterprise with FDCC settings.
The following Notes® Basic and Notes Standard clients are supported in the FDCC Desktop Configuration on Windows XP:
Install by Administrators only.
Lotus Notes® 6.5.3 (and later)
Lotus Notes 7.0.3 (and later)
Lotus Notes Basic 8.0.1 (and later)
Lotus Notes Standard 8.0.1 (and later)
Lotus Domino Web Access
Lotus Domino Web Access was tested and will be supported on the latest Maintenance Releases of the server: 6.5.6, 7.0.3, 8.0.1
Sametime® supports FDCC in both 7.5.1 CF1 and 8.0.
Logically, the list below is not approved one would imagine for average desktops.
The following is not supported in the FDCC Desktop Configuration*:
Install by Standard User
Nomad (USB device support)
Lotus Domino® Designer
Lotus Domino Administrator