Looks like Microsoft plays favorites here. They have alerted their Premium partners about the upcoming September patches due out today 9/14/2004.

http://arstechnica.com/news/posts/20040913-4179.html
A known but undisclosed security flaw in Microsoft Windows and Office is receiving special attention from the Redmond Giant, who notified its Premium customers of the flaws before the general public. The flaw, the details of which are not yet known, apparently affects Windows, Microsoft Office, Microsoft Visual Studio, and Microsoft .NET Framework. The flaw is rated as critical and the patch is to be released as early as tomorrow. A second patch with a less severe rating of "important" will also be released for Office customers. According to the private notice:

"At this time no additional information on these internal bulletins such as details regarding severity or details regarding the vulnerability will be made available until 14 September 2004."