This tutorial will show you how to enable or disable the ability to pin and unpin apps on the taskbar for specific or all users in Windows 7, Windows 8, and Windows 10. However, users cannot unpin these apps already pinned to the taskbar, and they cannot pin new apps to the taskbar. If any apps are already pinned to the taskbar, these apps continue to show in the taskbar. If enabled, users will no longer be able to Pin to taskbar and Unpin from taskbar apps. If you like, you can enable a policy that allows you to control pinning apps to the taskbar for users. You can make the taskbar look how you want, manage your calendar, pin your favorite apps to it, change the size, change location on screen, and specify how taskbar buttons group together when you have more than one window open. You can also see the date and time, system icons, and items running in the background on the notification area. The taskbar allows you to find, see, open, and switch between your apps.

Windows includes a special application desktop toolbar called the taskbar that shows on the bottom of a display screen by default. How to Enable or Disable 'Pin to taskbar' and 'Unpin from taskbar' for Apps in Windows

Itunes minimize to taskbar