Ah, miscommunication on my part, I think - I’ve got the Game.Exit call in the Game1 class in the shared project - and the error message about the method’s obsolescence is coming from the Windows Project, not the Windows Phone one:
Error 1 ‘Microsoft.Xna.Framework.Game.Exit()’ is obsolete: ‘“This platform’s policy does not allow programmatically closing.”’ C:\Leda Entertainment\Tests\ContentTest\ContentTest\ContentTest.Shared\Game1.cs 83 41 ContentTest.Windows
So I guess this is a trait of Windows Store apps - they never “quit” in the traditional sense?