Hi,
I haven't seen any official documentation about using Lync 2010 with Dragon Naturally Speaking, I do find a post indicates Dragon not being compatible with Lync 2010. See
http://nuance-community.custhelp.com/posts/fea5ec195b
Since I haven't found a trial download for Dragon Naturally Speaking, I couldn't verify it myself, I'd suggest you to contact the Dragon Naturally Speaking support to get more information.
BTW, for more Lync specific topic, I'd recommend the Lync forum catogory
http://social.technet.microsoft.com/Forums/en-US/category/lync
Max Meng
TechNet Community Support
