单项选择题 You have an Exchange Server 2010 organization.  You need to recommend a solution that prevents the permanent deletion of e-mail messages from the mailboxes of employee who have been dismissed from the company.  What should you recommend？（）

单项选择题 You have an Exchange Server 2010 organization.  You have a global security group named Legal that contains all the members of your companys legaldepartment.  The companys security policy states that the Legal group must be able to search all mailboxes for e-mailmessages that contain specific keywords.  You need to recommend a solution for the organization that complies with the security policy.  What should you include in the solution？（）

单项选择题 You have an Exchange Server 2010 organization that contains Windows Mobile 5.0 devices. Your company plans to replace all mobile devices with Windows Mobile 6.5 devices.  You need to identify which users accessed their mailboxes by using Windows Mobile 5.0 devices in thepast month.  What should you do？（）