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):
I like Windows Phone, I just think their apps need to be more polished.
Jejeje. Well if you are a phone developer, either an iOS guy who is thinking on offering
his/her apps in the MS Marketplace or just someone with a great interest in Windows Phone
then you should know what mango is.
Mango is a new update for the Windows Phone, and it will mean a lot for developers,
because if you already liked WP7 you will love MANGO.
Mango means HTML5 yes!
Mango means Multitasking!
Mango means Hands-free messaging, did you ever
wanted to send SMS without using your fingers, now you can!
I don’t think is mentioned in this video but Mango is also SQLCE a great alternative
for Android and iPhone developers who were using sqllite.