Office 2007 "Always use ClearType" option missing

Under T61 (Windows XP)

Office 2007 SP1 | options | popular | top options, has a check box for "Always use ClearType" which you can turn off.

see support.microsoft.com/kb/926705

It added an entry in

[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Common]
"RespectSystemFontSmooth"=dword:00000001

see discussion on geekswithblogs.net/glozano/archive/2006/11/14/97082.aspx

Under T400 (Windows Vista SP1)

For both Office 2007 SP1 and SP2, that option is missing for some reason. Setting the registry key directly does not work either. Reason unknown.