1. Open Microsoft Lync if it's not already open
  2. In Lync look for the Options gear icon

  3. Click the drop down arrow to bring up the menu

  4. Click Tools and Options

  5. Under Options click Personal on the left hand side. The deselect the field labeled "Automatically start Lync when I log in to Windows". Click "OK". The next time you restart Lync won't open after you login.