This is the email that I got from McAfee Tech support this afternoon:
ePO 3.6.1 users planning to manage or deploy to Windows 7 clients must upgrade to ePO 4.0 or ePO 4.5. The McAfee Agent Management NAP contained in the MA 4.0 Patch 3 package, does not contain the required updates to allow the management of Windows 7 clients. ePO 3.6.1 is approaching product end of life on Dec. 31, 2009.
We are going to have to start upgrading to EPO 4.0 in the next two weeks.