I have an IPA with Enterprise distribution (ProvisionsAllDevices=true), and I would like to distribute it to some testers using an ad hoc distribution. There is a way to convert it? I don't have the sources, so I can't export it form the Organizer window.
If you do not have access to the original source in Xcode, it is possible to resign the ipa using different Certificates/Provisioning Profile:
http://dev.mlsdigital.net/posts/how-to-resign-an-ios-app-from-external-developers/