After i installed my Exchange2010, i found that there are two new share folder "Group Metrics" and "address"generated. Could any tell me what are these? And will it has any effect if i disable those folders sharing?

You need those for mail tips. I wouldnt mess with them: http://technet.microsoft.com/en-us/library/dd298170.aspx Understanding Group Metrics http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/3e7ba52c-d9d5-4ea2-b4d6-a43928000cec http://msexchangeteam.com/archive/2009/04/28/451193.aspx