读取Exchange的用户未读邮件数3种办法

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;
        }