Surprise, surprise. HTC was slap with a lawsuit of over 20 patent infringement by Apple. I guess this action caught HTC by surprise. From Engadget updates, the lawsuit targets more on Android. As for Windows Phone, Apple is targeting at the DSP used in them.
Here are the phone models involved (Excerpt from Engadget).
We’ve just learned that Apple submitted over 700 pages of exhibits to the District Court, which is a little nuts. In addition, the ITC complaint lists a number of specific HTC handsets as exhibits, including the Nexus One, Touch Pro, Touch Diamond, Touch Pro2, Tilt II, Pure, Imagio, Dream / G1, myTouch 3G, Hero, HD2, and Droid Eris. That’s really a full range of HTC phones, running both Android and Windows Mobile, with and without Sense / TouchFLO. Interestingly, the Android sets are specifically included because they run Android, while the WinMo sets are called out specifically for including DSP chips, not anything to do with Windows Mobile.