A system and methodology providing service invocation for occasionally connected computing devices is described. In one embodiment, for example, in an occasionally connected computing environment, a system of the present invention for providing deferred invocation of services for a mobile device is described that comprises: an application running on a mobile device; a device-side object providing mobile support for a particular service from a server, the device-side object intercepting any requests from the application for invocation of the particular service, thereby deferring actual invocation of the particular service at that time; and a server-side object residing on the server that passes the requests on to a service provider for actual invocation while the mobile device is connected, and returns any result from the actual invocation back to the mobile device for use by the application.