The reason why many are angry because Nokia was open source. Apple has always been closed source so its not a big deal. But Microsoft is closed source & many are disappointed.
Symbian was open source, only because of Nokia's generosity. They bought the company behind Symbian OS and contributed it to the Symbian foundation. But then other supporters of the project never provided the support that they agreed to do. If people are angry, then they should be angry and those who bailed such as:
Sony Ericsson, NTT DoCoMo, Motorola, Texas Instruments, Vodafone, LG Electronics, Samsung Electronics, STMicroelectronics and AT&T.
Nokia was the only company really doing anything with it. Finally they said, why should they pull all of the weight by themselves, when everybody else had bailed.