15 apps seems like a lot when you talk about push notifications, especially considering battery life (although push is better than pull). According to a blog post by Clarity Consulting, Windows Phone 7 limits the number of apps that can be registered for push notifications to 15. If you install a 16th app, you’ll get an error about “InvalidOperationException(Channel quota exceeded)” (sounds like a common Microsoft error message, right?).

As the OS matures, hopefully this limit will be changed with future updates, like the one coming in Q1 2011. As stated in that blog though, this isn’t a very well documented limit, and it could become a bigger issue as the Market grows. There’s not many apps out there that utilize push notifications, but when you add in the possibilities of weather, Twitter, Facebook, instant messaging, stocks, email, RSS readers, etc, 15 doesn’t seem like a very high limit.

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