It seems ironic but it seems that it is a little more difficult to configure Windows Phone 7 and 7.5 to work with MS Lync that it is to configure an iPhone or an iPad.
Well after trying for a while without success, I found this page: http://leonmeijer.nl/archive/2012/01/25/153.aspx
The steps are (and i quote):
Steps:
I like Windows Phone, I just think their apps need to be more polished.
If you are getting ready to migrate your applications to Windows Phone,
you have to install all the neccesary Windows Phone Stuff.
However you might have incompatibilities in your dev machine.
This post: http://blogs.msdn.com/b/astebner/archive/2010/07/12/10037442.aspx
Is great. I used it to identity why the installation tool insisted that
I had a Windows Phone Emulator installed in my machine. It seems that it looked for something like XDE.
So if you have this same issue or something similar just take a look at that post, it might be of great help