http://blogs.technet.com/b/premal/archive/2010/12/30/lync-groupchat-2010-ucma-application-does-not-work-even-after-successful-installation-with-eventid-5286.aspxSymptom ======== Lync GroupChat 2010 (UCMA Application) does not work, even after successful installation with EventID 5286. Cause ===== During installation if the Application Pool Name box is empty, you can specify an applicationen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)