单项选择题 You work as the enterprise exchange administrator at Xxx .The Xxx network consists of a domain named xxx .Xxx is using Microsoft Exchange Server 2010.The Xxx network contains a server named XXX-EX10 configured with the following roles. （1）Client Access Role  （2）Hub Transport Role  （3）Mailbox Server Roles  What action must you take to guarantee e-mail availability to Xxx users who are are utilizing regular mail clients like Microsoft Outlook Express or Windows Live Mail？（）

单项选择题 YouworkastheenterpriseexchangeadministratoratXxx.TheXxxnetworkconsistsofadomainnamedxxx.XxxhasthreeExchangeServer2007mailserversnamedXXX-EX01，XXX-EX02andXXX-EX03thathasthefollowingimplementation：records.WhatactionmustyoutaketomakesureoftheavailabilityofthemailboxesonXXX-EX03iftheemployeesutilizetheExchangeActiveSyncaftertheinstrallationofXXX-EX04？（）

单项选择题 You work as the enterprise exchange administrator at Xxx .The Xxx network consists of a domain named xxx .The Xxx network has three mail servers named XXX-SR11， XXX-SR12 and XXXSR13 that has the following implementation：  （1）2003 SP2.  （2）2003 SP2.  （3）running Exchange Server 2010.  How can you perform the migration of the mailboxes from XXX-SR12 to XXX-SR13 and to assure the availability of the mailboxes？（）