Before you upgrade servers to Unwired Platform version 2.2, you must ensure that any iOS and BlackBerry applications created in earlier versions have a domain assigned.
In Unwired Platform version 2.2, application push configurations are associated with both applications and domains. When you upgrade version 2.1.x push configurations to version 2.2, the upgrade installer creates push configurations for each domain of an application. If there is no domain assigned to an application, no push configuration is created.
To migrate push configurations, you must assign all domains, or desired domains, to any application that is not directly associated with a domain before you upgrade your servers. This applies to both iOS applications using APNS and BlackBerry applications using BES.