The Lync 2010 SDK does not provide speech recognition or synthesis, however UCMA does. We have a 5 part technical article that takes you through how to include Speech in your Lync application
Using Speech Recognition in UCMA 3.0 and Lync 2010: Scenario Overview (Part 1 of 5)
http://msdn.microsoft.com/en-us/library/hh228139.aspx
-- How To Ask a Question: http://support.microsoft.com/kb/555375 -- This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm