If you install iOS4 on a mac with iTunes 9.2 (or with vmware) and activate it there, can you after activating it use it on a windows pc with the previous itunes and sync music, movies and apps and all as normal?
Basically; is activation AND usage limited to 9.2 only?
iOS4 will only sync with iTunes 9.2, so you must use that exclusively once the phone is on 4.0