1、开通IMAP服务，采用IMAP方法读取，需要提供用户和密码

IMAP_Client imap = new IMAP_Client();//链接imap.Connect(server, port, ssl);
//账户需要加上后缀名称,组合成"username@bzy.com"格式
//
account = string.Format("{0}{1}", account,ExchangeManageConfig.ExchangeDomail);
//验证账户imap.Authenticate(account, password);

2、采用EWS读取邮件，默认取当前用户的登录认证方式（或提供用户和密码）

 //// TODO: 在此处添加构造函数逻辑//实例化对象_esb = new ExchangeServiceBinding();//授权-默认权限ICredentials creds = System.Net.CredentialCache.DefaultNetworkCredentials;_esb.Credentials = creds;/设置webservice的URL_esb.Url = ExchangeManageConfig.ExchangeWebUrl;

3、采用EWS API方式。授权一个账户有模拟其他用户的权限

1.安装 Exchange Web Services Managed API，当前版本1.1           2.授权一个账户有模拟其他用户的权限，打开Exchange 2010 服务器在命令行中输入New-ManagementRoleAssignment -Name:impersonationAssignmentName -Role:ApplicationImpersonation -User:serviceAccount　serviceAccount：就是我们要模拟其他人的账户

protected void Page_Load(object sender, EventArgs e){EwsConfig config = new EwsConfig();config.ExchangeVersion=ExchangeVersion.Exchange2010_SP1;config.EWSServiceUrl="https://********/EWS/exchange.asmx";config.ExchangeAdministrator = "<UserName>";config.ExchangeAdministratorPassword = "<PWD>";config.DomainName = "<domainName>";config.OtherUserName = "<otherUserName>";//下面这句屏蔽服务器证书验证，防止页面报“根据验证过程，远程证书无效”的错误                                ServicePointManager.ServerCertificateValidationCallback =delegate(Object obj, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; };ExchangeService service = new ExchangeService(config.ExchangeVersion);service.Credentials = new NetworkCredential(config.ExchangeAdministrator, config.ExchangeAdministratorPassword, config.DomainName);       service.Url = new Uri(config.EWSServiceUrl);//前提打开Exchange 2010服务器在命令行中输入：             //New-ManagementRoleAssignment -Name:impersonationAssignmentName -Role:ApplicationImpersonation -User:<UserName>service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.PrincipalName, config.OtherUserName);int unRead=Folder.Bind(service, WellKnownFolderName.Inbox).UnreadCount;HttpContext.Current.Response.Write(config.OtherUserName+"未读邮件数："+unRead);}public struct EwsConfig{public ExchangeVersion ExchangeVersion;public string EWSServiceUrl;public string ExchangeAdministrator;public string ExchangeAdministratorPassword;public string DomainName;public string OtherUserName;}