title: lync extension development
body: <p>Could anyone please send me some urls or code samples for develop extension for lync 2010.</p>
  
  <p>I mean development some tools which can integrated into lync 2010 as extension.
  add a menu or button to lync 2010, when click the menu or button, the customerized tool will popup.</p>
  
  <p>Thanks a lot.</p>