Microsoft’s April 2010 security updates have passed Citrix testing (the updates are listed below). The testing is not all-inclusive; all tests are executed against English only environments and issues may still be found upon implementation. Follow best practices for testing and installing software updates/patches in a development environment before implementing the updates in a production environment.
Where applicable, the updates were tested on Microsoft Windows XP, Window Vista, Windows 7, and Windows Server 2003 platforms with Citrix Presentation Server / XenApp and other Citrix products.
MPEG Layer-3 Codecs
Windows Media Player
Visit the Microsoft Security (TechNet) page to view Microsoft security updates.