In a funny Tweet from @abhinaba, developer in the .NET Compact Framework (Windows Phone 7) team, gives details how the WP7 group was naming the 'Mango' milestones. In short, they were doing an A, B, C thing but with mango names. Kind of sounds like a certain Google/Android tactic with their dessert fetish going on.
Only problem: there's not enough mangos to keep the list going :-/
Source: @abhinaba; via @longzheng