The Apple Airport Express is just a peripheral that utilizes an Ethernet cable to connect to your existing router or switch to create a wireless access point that provides Wi-Fi connectivity to all your devices.
In addition, there is no correlation between an Apple Airport Express and the Apollo's interoperability of supporting music or video streaming.

The Apollo Cloud requires the following prerequisites in order to establish a successful deployment:

1. The Apollo Cloud device must be connected to the Internet.
2. All your devices must be connected to the Internet through Wi-Fi or Ethernet.
3. All your devices must have the Apollo application installed.

If the prerequisites above have been properly established, users will be able to stream music and video content from their Apollo Cloud unit on iOS and Android devices.

Note: The Apollo application in Mac OS X and Windows can only support video streaming and playback; however, it does not support playback for music.