PC World reports that Microsoft has started rolling out the official "Mango" update to Windows Phone 7 devices, along with a couple surprise updates.

Now "Mango" is here. "Mango" is a major update with more than 500 changes and updates to the Windows Phone system. That is why Microsoft is now calling it Windows Phone 7.5 instead of Windows Phone 7.

I have been playing with a pre-release beta version of "Mango" for the 30 Days With Windows Phone 7 series, so I have already had an opportunity to explore some of the new features. I have been very impressed.

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