As noted in our original post which broke news of the software, iOS 5 (Beta 4) does, in fact, activate wireless syncing over Wi-Fi for those on Microsoft Windows. Turned on in iOS 5 (Beta 2), iOS 5′s Wi-Fi Sync feature previously only allowed Mac users to wirelessly sync their iOS devices to iTunes over-the-air.
However, with the introduction of iOS 5 (Beta 4) on Friday, Apple has activated the feature for PC users, too.
From the release notes:
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In iOS 5 beta 4, wireless syncing is now available on Windows as well as the Mac (requires OS X 10.6.8 or Lion). You will see an option to enable wireless syncing when you connect your device to iTunes with the USB cable. It is recommended you perform your initial sync with a cable after restoring your device.”