There have been some weird posts circulating on whether or not there is a push notifications limit. Microsoft had come out earlier to say that at the moment there is a limit to the amount of push notifications which can be active at a time. That number at the moment is 15 but this is bound to change as they get a greater idea of what their users want. Microsoft has already come out and said that it was designed in such a way for the general users and not power users. SO hopefully they will be able to fix this is a new update so that it will simply just be available for everybody. I feel that though Windows Phone 7s are great devices there is still some issues of reliability preventing them from becoming one of the top smartphone OS.

Source: BGR