No too long it was reported that HTC would not be rolling-out updates to Android 2.2 FroYo until
href="http://www.product-reviews.net/2010/07/12/andoid-2-2-froyo-update-for-sense-ui-smartphones-expected-at-christmas/">Christmas, however we can now confirm that HTC Desire owners in Europe can expect the update this weekend.
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From what we can see as long as you do not own a carrier-locked Desire you should get the update over-the-air by the end of the week, carrier specific versions of the update may not arrive until later in August.