Yesterday HTC gave more information as to why the Desire HD (or HTC Ace) will not be included in the HTC’s round of updates to Ice Cream Sandwich.
The Desire HD was launched in October 2010, and originally had Android 2.2 Froyo, which was later upgraded to 2.3.5 Gingerbread. The HTC blog goes in to a bit more detail about the reason for not upgrading to ICS:
For more background, due to how storage on the HTC Desire HD is partitioned – and the larger size of Android 4.0 – it would require re-partitioning device storage and overwriting user data in order to install this update. While technically advanced users might find this solution acceptable, the majority of customers would not. We also considered ways to reduce the overall size of the software package, but this would impact features and functionality that customers are currently using. Even after installing the update, there were other technical limitations which we felt negatively impacted the user experience.
Which seems like a fair explanation to me, the majority of everyday users would not want to mess around backing up their device to a PC/Mac, to do a full wipe of their phone. It could have resulted in a lot of unhappy customers.
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Source: HTC Blog
You will also find a list of the HTC devices getting the ICS update on the link above.