单项选择题 You have an Active Directory forest that contains a single Active Directory site.Your organization contains the Exchange Server 2010 servers shown in the following table. All clients connect to Server1 and Server2 from the Internet by using IMAP4.You need to prevent some users from using IMAP4 to connect to their mailboxes on Server2.What should you do？（）

单项选择题 You have an Active Directory domain named contoso.com.You have an Exchange Server 2010  organization that contains a Client Access server named CAS1.Users connect to CAS1 from the Internet by using mail.contoso.com.The organization contains the following mobile clients：  （1）Windows Mobile 5.0 （2）Windows Mobile 6.1  （3）Windows Mobile 6.5  You plan to install a certificate on CAS1.You need to ensure that all clients can connect to CAS1 from the Internet by using Exchange ActiveSync.Which name should you include in the certificate？（）

单项选择题 Your network contains one Exchange Server 2010 Client Access server named Server1.You have a user named User1.You need to limit the size of the attachments that User1 can download by using Exchange ActiveSync.The solution must not affect other users. What should you do first？（）