Microsoft is ending support for Windows XP and Office 2003 on April 8, 2014. The official announcement is published here:
These products are certified for desktop clients accessing the E-Business Suite today. Our general policy is that we support certified third-party products as long as the third-party vendor supports them. When the third-party vendor retires a product, we consider that to be an historical certification for EBS.
What can EBS customers expect after April 2014?
After Microsoft desupports WinXP and Office 2003 in April 2014:
What should EBS customers do?
Oracle strongly recommends that E-Business Suite customers upgrade their desktops from Windows XP and Office 2003 to the latest certified equivalents. As of today, those are Windows 7 and Office 2010.
Certifications for Windows 8 and Office 2013 are still underway; you can monitor this blog for updates on those pending certifications. EBS customers should avoid deploying Win8 or Office 2013 to end-users who depend on the E-Business Suite until these certifications are announced.