Hi All, I need to build an Iphone application that utilizes Apple's Push Notification Service. So far, I know that I need to install the SSL Certificate on Push Notification Provider to connect with APNS. But I have a Windows Server 2008 (Push Notification Provider). So, is it possible to install the SSL Certificate on Server running Window XP? Anyone have any ideas to do this? Another thing is I know that the Iphone application need register to APNS using application:didRegisterForRemoteNotificationsWithDeviceToken: method. My question is how many times the application need to register to APNS? Is it one time only (that is register when the application first launch)? Or need register many times (that is register everytime user use the application)? Any comments and ideas are welcome. Thanks a lot.