Q: Airplay icon disappeared since upgrade to Itunes 12 using windows vista

Hey there josmith1971,

If your Airplay icon is missing from your computer and you cannot airplay to the Sony Micro system, you should use the following article to help get that resolved, named:

iTunes: Troubleshooting AirPlay and AirPlay Mirroring - Apple Support

Try these steps first:

1. Verify that you are using the latest version of iTunes.
   • iTunes for Mac: Choose iTunes > Check for Updates
 
   • iTunes for Windows: Choose Help > Check for Updates
2. Verify that all your AirPlay-enabled devices' software is up to date. 
3. Verify that all your AirPlay-enabled devices are connected to the same home network.
   Note: Some Wi-Fi network configurations offer a guest network that can block certain Internet services from working or seeing other devices on your home network. 

If the AirPlay icon doesn’t appear in iTunes

Ensure that you followed these steps to use AirPlay in iTunes.

If the AirPlay icon  still doesn't appear, try one of the following steps:

 

• If you want to AirPlay to an Apple TV, ensure that AirPlay is enabled on the Apple TV.  From the Apple TV main menu, go to Settings > AirPlay. This should be set to On.
• If you want to AirPlay to an Airport Express, ensure that AirPlay is enabled in the device settings.
• If you want to AirPlay to a 3rd party AirPlay-enabled device, refer to the user guide.

Thank you for using Apple Support Communities.

All the best,

Sterling

Thank you for using the Apple Support Community. Due to the nature of your issue you may find more information by using another one of Apple's support resources - https://getsupport.apple.com/GetproductgroupList.action.