http://blogs.technet.com/b/lystavlen/archive/2012/05/16/why-cant-i-upload-content-to-my-lync-online-meeting.aspxIf you organize an online meeting and you find yourself not being able to upload content and receive an error message, then... Verify that the file size of the content that you want to upload is not too large. PowerPoint presentations, Microsoften-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)