i don't know if anyone is active right now here or if it is of any interest. anyway here is what i found out. i had an n9 set up with a google exchange account, i flashed it in september 2016 and i still was able to connect. charging was not easy with this device, don't know if there was a loose contact, but anyway i bought a second hand n9, set up the exchange account and it wasn't working. so i don't know how they did it, but it must be something really hardware specific. i can only think of the mac address maybe... oh i should try this out^^