HTC explains decision to skip Android 4.0 for Desire HD
 

HTC dampened a few spirits when it dropped the Desire HD from its Android 4.0 upgrade list. The company might feel your pain, but it claims to have a good reason for denying the update that it's been doling out elsewhere. There's no way to shoehorn a new version into the device like there was for the Desire's leap to Android 2.3, the company says. Fitting all that Ice Cream Sandwich into the Desire HD would require repartitioning the internal space, and repartitioning risks overwriting personal content; needless to say, the company isn't keen on explaining why it might nuke our family photos just so we can run Chrome. Even if that weren't an issue, a nebulous set of "other technical limitations" might not rub upgraders the right way. All of the explanations add up, although it's nonetheless easy to sympathize with Desire HD owners now stuck in Gingerbread land -- especially as owners of the closely related Thunderbolt aren't being held back.

http://www.engadget.com/2012/07/28/h...for-desire-hd/