Microsoft® Windows SharePoint® Services (WSS V2) Service Pack 3 (SP3) represents a major evolution in security for Windows SharePoint Services. It further hardens Windows SharePoint Services against potential attacks and other security threats. This service pack also includes fixes that have been previously released as separate updates for Windows SharePoint Services.
Microsoft Knowledge Base article (923643): http://support.microsoft.com/kb/923643

Download
http://www.microsoft.com/downloads/details.aspx?FamilyId=2BBFC89B-EB59-49FF-B58F-684693CB25A7

Microsoft® Office SharePoint Portal Server® 2003 (SPS 2003) Service Pack 3 (SP3) represents a major evolution in security for SharePoint Portal Server 2003. It further hardens SharePoint Portal Server against potential attacks and other security threats. This service pack also includes fixes that have been previously released as separate updates for SharePoint Portal Server 2003.
Microsoft Knowledge Base article (923644): http://support.microsoft.com/kb/923644

Download
http://www.microsoft.com/downloads/details.aspx?FamilyID=AB086D48-1148-48DE-B4EC-A6298367E5F0

Daylight Saving Changes updates for MOSS and WSS

In addition to DST changes in North America, there will be time changes in New Zealand and Western Australia that were not accounted for in the previous DST related hot fixes or software releases.

Microsoft strongly recommend that you install the latest updates for SharePoint as described in the following links:

• Windows SharePoint Services 3.0: http://support.microsoft.com/gp/dst_prodlist#WSS3
• Windows SharePoint Services 2.0: http://support.microsoft.com/gp/dst_prodlist#WSS2

For the overall listing of Microsoft product updates related to DST changes, go to: http://support.microsoft.com/dst2007.