Among the main features of products Flash Media Server 3 developers allocate support H.264 standard and High Efficiency AAC (HE-AAC). Moreover, in fact, the new package allows really almost double the number of broadcast streams per server. The company also mentions Adobe in my opinion improved security and greater stability.

Adobe ® Flash ® Media Interactive Server 3 software has the unique combination of powerful streaming media capabilities and a flexible environment for creating and delivering interactive social media applications to the broadest possible audience. It offers dramatically improved performance, more secure streaming, live streaming enhancements, industry-standard H.264 and HE-AAC support, and streaming delivery to mobile phones with Adobe Flash Lite ™ 3 and Adobe Media Player software.

Top features in Flash Media Interactive Server:
• Major performance gains
• More secure content delivery
• H.264 video and HE-AAC audio
• Live video support
• Mobile delivery to Flash Lite 3
• New plug-in architecture
• AMF3 support
• Multipoint publishing
• Video recording
• Server redirection handling
• Stream data access
• Logging
• Network efficiency
• Bandwidth detection
• Advanced seek feature

What's new:

Major performance gains
Video streaming performance more than doubles in Flash Media Server 3, allowing more streams and users per server. Incorporating features previously found in the Edge and Origin Editions, Flash Media Interactive Server can serve as either an Origin or an Edge to allow for virtually unlimited scalability.

More secure content delivery
Flash Media Interactive Server features RTMPE 3, an enhanced version of Adobe's Real Time Messaging Protocol (RTMP), with higher performance and 128-bit encryption to help secure streamed media and communication. A new verification feature protects SWF files from being reused, modified, or hosted in unauthorized locations. The new plug-in architecture can also be used to create custom authorization adaptors, such as validation with an external LDAP server.