Today VMware has announced that there wont be a vSphere Client (also known as the C# Client) with the future releases of VMware vSphere product. So you will not see the vSphere Client anymore with the future releases and is dead. The alternative solution is to use is the HTML5 Client which you can try from the VMware Fling Website.
Its time to say thank you so much for all the support that we got over the last few years and we really gonna miss the you, the thick client. Thank you….
Here is a link to the announcement: