After this date, Office 2003 products including SharePoint Portal Server 2003 product will no longer receive the following:

• Assisted support
• Online content updates
• Software updates from Microsoft Update
• Security updates to help protect your PC from harmful viruses, spyware, and other malicious software, which can steal your personal information.

After 12 years, support for Windows XP , There will be no more security updates or technical support for the Windows XP operating system. It is very important that customers and partners migrate to a modern operating system such as Windows 8.1. Customers moving to a modern operating system will benefit from dramatically enhanced security, broad device choice for a mobile workforce, higher user productivity, and a lower total cost of ownership through improved management capabilities.
http://www.microsoft.com/en-us/windows/enterprise/end-of-support.aspx