The IMF update for Exchange Server 2003 will skip the traditional first Wednesday update of each month and the next update will be in the thrid Wednesday.
This is just a quick note that the regularly scheduled Exchange Server 2003 Intelligent Message Filter update that was set to be released on 1/7/2009 will not be happening. The next release for this update will be on 1/21/2009.
For those that might not know, this update is released on the first and third Wednesday of every month except for the month of December. December will see only a release during the first week of the month.
Read more at source: http://msexchangeteam.com/archive/2009/01/06/450362.aspx