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I just installed Windows 7 x64 this weekend. iTunes is working great. iTunes and the iPhone on 3.0.0 version were talking to each other just fine. So I decided it was safe to update to 3.0.1 because I was hoping it would fix the major lag/speed issue introduced in 3.0, not to mention the text message vulnerability. The iPhone works fine, and iTunes still works fine.
However...
When I attach the iPhone to the computer now iTunes gives a message occasionally how it detects an iPhone but cannot attach to it. I have to detach and reattach the iPhone and itll eventually randomly decide hey I think I can read this now.
3G iPhone OS 3.0.1 Windows 7 x64