HTC HD7 is a great phone from HTC which is also known as HTC HD3, HTC Gold, HTC Diamond3 and HTC Mondrian. It is first Windows 7 smartphone from HTC. HTC has also released 2 more Windows 7 based smartphones along HD7. They are HTC 7 Mozart and HTC 7 Trophy. I think the purpose of releasing those smartphones is to provide smartphone user slightly low price smartphones with Windows 7 operating system with little less specification and size.
We may discuss other smartphones in detail later on. Currently my focus is Desire HD and HD7. The main difference between these two is operating system. HD7 is Windows based while Desire HD is android based that is supported by Google itself.