If you don’t know what is happening when you create an iPa file and the organizer pops up when Archive succeeds without Share button. Here is the solution.
First thing, check whether you are using the latest XCode. If you are using latest Xcode 4.3 above. You will not find share button instead, you will be provided with Validate and distribute. Click Distribute and select “Save for Ad-Hoc Deployment” and create iPa. It will work like a charm.