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App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <appSettings>
+    <add key="TelegramBotToken" value="YOUR_BOT_TOKEN" />
+    <add key="TelegramChannelId" value="YOUR_CHANNEL_ID" />
+  </appSettings>
+</configuration> 

OutlookTelegramNotifier.cs

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+using Microsoft.Office.Interop.Outlook;
+using System;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+using Telegram.Bot;
+
+namespace OutlookTelegramNotifier
+{
+    [ComVisible(true)]
+    public class OutlookTelegramNotifier
+    {
+        private Application outlookApp;
+        private TelegramBotClient botClient;
+        private const string TELEGRAM_BOT_TOKEN = "YOUR_BOT_TOKEN";
+        private const string TELEGRAM_CHANNEL_ID = "YOUR_CHANNEL_ID";
+        private Timer checkTimer;
+
+        public OutlookTelegramNotifier()
+        {
+            outlookApp = Globals.ThisAddIn.Application;
+            botClient = new TelegramBotClient(TELEGRAM_BOT_TOKEN);
+            
+            // Запускаем таймер для проверки событий каждую минуту
+            checkTimer = new Timer(CheckUpcomingMeetings, null, 0, 60000);
+        }
+
+        private async void CheckUpcomingMeetings(object state)
+        {
+            try
+            {
+                var calendar = outlookApp.Session.GetDefaultFolder(OlDefaultFolders.olFolderCalendar);
+                var items = calendar.Items;
+                items.Sort("[Start]");
+                
+                var now = DateTime.Now;
+                var fifteenMinutesFromNow = now.AddMinutes(15);
+
+                foreach (AppointmentItem appointment in items)
+                {
+                    if (appointment.Start > now && appointment.Start <= fifteenMinutesFromNow)
+                    {
+                        // Проверяем, не отправляли ли мы уже уведомление для этой встречи
+                        if (!appointment.UserProperties["NotificationSent"]?.Value)
+                        {
+                            await SendTelegramNotification(appointment);
+                            
+                            // Отмечаем, что уведомление отправлено
+                            var prop = appointment.UserProperties.Add("NotificationSent", OlUserPropertyType.olYesNo);
+                            prop.Value = true;
+                            appointment.Save();
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                // Обработка ошибок
+                System.Diagnostics.Debug.WriteLine($"Error: {ex.Message}");
+            }
+        }
+
+        private async Task SendTelegramNotification(AppointmentItem appointment)
+        {
+            var message = $"🔔 Напоминание о встрече\n\n" +
+                         $"📅 {appointment.Subject}\n" +
+                         $"⏰ Начало: {appointment.Start:HH:mm}\n" +
+                         $"📍 {appointment.Location}\n\n" +
+                         $"Описание: {appointment.Body.Substring(0, Math.Min(appointment.Body.Length, 100))}...";
+
+            await botClient.SendTextMessageAsync(
+                chatId: TELEGRAM_CHANNEL_ID,
+                text: message
+            );
+        }
+    }
+} 

ThisAddIn.cs

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+using System;
+using Microsoft.Office.Tools.Outlook;
+
+namespace OutlookTelegramNotifier
+{
+    public partial class ThisAddIn
+    {
+        private OutlookTelegramNotifier notifier;
+
+        private void ThisAddIn_Startup(object sender, System.EventArgs e)
+        {
+            notifier = new OutlookTelegramNotifier();
+        }
+
+        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
+        {
+            // Cleanup code here
+        }
+
+        #region VSTO generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InternalStartup()
+        {
+            this.Startup += new System.EventHandler(ThisAddIn_Startup);
+            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
+        }
+        
+        #endregion
+    }
+}