http://www.winrumors.com/microsoft-flattered-with-apples-ios-5-windows-phone-features/
Notifications: from Android and a bit from WP7 (Years/8 months)
Camera: Button from WP7 and above the lock screen from WP7 (8 months)
Split keyboard: Windows 8/Windows XP tablets (Years and years)/Chrome OS tablet concepts
Twitter: WP7 Mango
iMessage:WP7 Mango/BBM
Photo upload: WP7 (8 months old)
WiFi Sync: WP7 (8 months old)
This isnt to say that Apple "stole" all these ideas. Its to point out that you shouldnt go around saying Microsoft simply steals all of Apple's ideas. Its just the nature of tech.
Apple also copied the idea of a phone from whoever invented it. Then they copied the screen from whoever invented it. I guess you can say they also copied the glass from whoever invented it. Oh they also copied the buttons and the idea behind a metallic frame as someone came up with that first as well. Yup - Apple copies.
/Fools