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You don't need to use their app for push on iOS. They worked with Apple to enable push in the built-in client.

• kaivi 8y ago
  Woah, did not know that. Thank you sir! Time to migrate my personal mail I guess.
• beagle3 8y ago
  Doesn’t anything that speak the exchange protocol (e.g. Zarafa and anything else that uses Z-Push) also support it?