Visual Studio 2008 Unattended Setup Fails on Longhorn

Problem: Visual Studio 2008 unattended setup from DVD fails on Windows Server 2008 (Longhorn) RC0
Root Cause: Unattended setup is not supported from DVD
Work-Around: Run unattended setup from a network share.

We had the bright idea for unattended Visual Studio 2008 setup. The theory was that we would create the unattend file using setup's CreateUnattend switch, copy it to the DVD and update autorun to trigger the unattended installation. All our devs would need to do is load the DVD, go get a cup of coffee and voilà! VS 2008 would be ready for action.

Unfortunately, it didn't work as expected. After several attempts with minor changes (full path, quoted path, etc.), I finally dug into the log files (in \Users\AppData\Local on Longhorn). Setup creates at least 3 log files in this folder - dd_depcheck_VS_PRO_90.txt, dd_error_vs_procore_90.txt and dd_install_vs_procore_90.txt. The error file was sufficiently helpful. The first 2 lines show:

[11/26/07,15:45:23] vs70uimgr: [2] Admin deployment is not allowed from a
CD/DVD.

[11/26/07,15:45:23] setup.exe: [0] InitializeUIManager(), Start
failure

That's pretty clear and straight-forward.