单项选择题 YouhaveanExchangeServer2010organization.YouneedtopreventusersfromchangingtheirpasswordbyusingOutlookWebApp（OWA）.Whatshouldyoudo？（）

多项选择题 You have an Exchange Server 2010 server.You need to prevent users from accessing public folders by using Outlook Web App （OWA）.Your solution must not prevent users from accessing public folders by using Office Outlook. Which two actions should you perform？（）

单项选择题 You have an Exchange Server 2010 organization.The organization is authoritative for the domain contoso.com.You create a federated trust.You need to ensure that federated partners can automatically locate the Client Access servers in the organization. What should you create from an external DNS server？（）