using Microsoft.Exchange.WebServices.Data;
using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        // 创建EWS服务对象
        ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
        
        // 设置凭据（使用管理员账户）
        service.Credentials = new WebCredentials("admin@domain.com", "password");
        
        // 设置EWS URL
        service.Url = new Uri("https://mail.domain.com/EWS/Exchange.asmx");
        
        // 获取所有邮箱用户（需要适当的权限）
        List<string> mailboxes = GetAllMailboxes(service);
        
        foreach (string mailbox in mailboxes)
        {
            Console.WriteLine($"Processing mailbox: {mailbox}");
            
            // 为每个邮箱模拟身份
            service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, mailbox);
            
            // 获取邮件
            GetMailItems(service);
        }
    }

    static List<string> GetAllMailboxes(ExchangeService service)
    {
        // 这里需要实现获取所有邮箱的逻辑
        // 可能需要使用Exchange Management Shell或AD查询
        // 以下是示例数据
        return new List<string>
        {
            "user1@domain.com",
            "user2@domain.com",
            "user3@domain.com"
        };
    }

    static void GetMailItems(ExchangeService service)
    {
        // 创建邮件文件夹视图
        FolderView folderView = new FolderView(100);
        folderView.Traversal = FolderTraversal.Deep;
        
        // 获取所有邮件文件夹
        FindFoldersResults folders = service.FindFolders(WellKnownFolderName.MsgFolderRoot, folderView);
        
        foreach (Folder folder in folders)
        {
            // 创建邮件视图
            ItemView view = new ItemView(100);
            
            // 获取文件夹中的邮件
            FindItemsResults<Item> findResults = service.FindItems(folder.Id, view);
            
            foreach (Item item in findResults)
            {
                if (item is EmailMessage email)
                {
                    // 加载邮件属性
                    email.Load(new PropertySet(
                        ItemSchema.Subject,
                        ItemSchema.DateTimeReceived,
                        EmailMessageSchema.From,
                        EmailMessageSchema.ToRecipients
                    ));
                    
                    Console.WriteLine($"Subject: {email.Subject}");
                    Console.WriteLine($"Received: {email.DateTimeReceived}");
                    Console.WriteLine($"From: {email.From.Address}");
                }
            }
        }
    }
}