Add project files.

OutlookHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+using Outlook = Microsoft.Office.Interop.Outlook;
+
+namespace OutlookCaseHelper
+{
+    public class OutlookHelper
+    {
+        private Outlook.Application outlookApp;
+        private Outlook.NameSpace outlookNamespace;
+
+        public OutlookHelper()
+        {
+            outlookApp = new Outlook.Application();
+            outlookNamespace = outlookApp.GetNamespace("MAPI");
+        }
+
+        // Get Tracking ID from selected email subject
+        public string? GetSelectedEmailTrackingId()
+        {
+            try
+            {
+                Outlook.Explorer activeExplorer = outlookApp.ActiveExplorer();
+                if (activeExplorer == null)
+                    return null;
+
+                Outlook.Selection selection = activeExplorer.Selection;
+                if (selection.Count == 0)
+                    return null;
+
+                Outlook.MailItem email = selection[1] as Outlook.MailItem;
+                if (email == null)
+                    return null;
+
+                // Subject pattern: "Something - TrackingID1234567890123456"
+                string pattern = @"TrackingID(\d+)";
+                Match match = Regex.Match(email.Subject, pattern);
+
+                if (match.Success)
+                    return match.Groups[1].Value;
+
+                return null;
+            }
+            catch
+            {
+                return null;
+            }
+        }
+
+        // Create folder and move all emails with this tracking id
+        public bool CreateFolderAndMoveEmails(string trackingId)
+        {
+            try
+            {
+                Outlook.Folder inboxFolder =
+                    outlookNamespace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox) as Outlook.Folder;
+
+                Outlook.Folder casesFolder = GetOrCreateFolder(inboxFolder, "Cases");
+                Outlook.Folder activeFolder = GetOrCreateFolder(casesFolder, "Active");
+                Outlook.Folder trackingFolder = GetOrCreateFolder(activeFolder, trackingId);
+
+                MoveEmailsWithTrackingId(inboxFolder, trackingId, trackingFolder);
+
+                Outlook.Folder sentFolder =
+                    outlookNamespace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail) as Outlook.Folder;
+                if (sentFolder != null)
+                    MoveEmailsWithTrackingId(sentFolder, trackingId, trackingFolder);
+
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        // Remove rule: move folder from Active to Closed
+        public bool RemoveRuleAndMoveToClosed(string trackingId)
+        {
+            try
+            {
+                Outlook.Folder inboxFolder =
+                    outlookNamespace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox) as Outlook.Folder;
+
+                Outlook.Folder casesFolder = GetFolder(inboxFolder, "Cases");
+                if (casesFolder == null) return false;
+
+                Outlook.Folder activeFolder = GetFolder(casesFolder, "Active");
+                if (activeFolder == null) return false;
+
+                Outlook.Folder trackingFolder = GetFolder(activeFolder, trackingId);
+                if (trackingFolder == null) return false;
+
+                Outlook.Folder closedFolder = GetOrCreateFolder(casesFolder, "Closed");
+                MoveAllItemsFromFolder(trackingFolder, closedFolder);
+
+                try
+                {
+                    activeFolder.Folders.Remove(trackingId);
+                }
+                catch { }
+
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        private Outlook.Folder GetOrCreateFolder(Outlook.Folder parent, string name)
+        {
+            foreach (Outlook.Folder folder in parent.Folders)
+            {
+                if (folder.Name == name)
+                    return folder;
+            }
+
+            return parent.Folders.Add(name) as Outlook.Folder;
+        }
+
+        private Outlook.Folder? GetFolder(Outlook.Folder parent, string name)
+        {
+            foreach (Outlook.Folder folder in parent.Folders)
+            {
+                if (folder.Name == name)
+                    return folder;
+            }
+            return null;
+        }
+
+        private void MoveEmailsWithTrackingId(Outlook.Folder source, string trackingId, Outlook.Folder dest)
+        {
+            var toMove = new List<Outlook.MailItem>();
+
+            foreach (object item in source.Items)
+            {
+                Outlook.MailItem mail = item as Outlook.MailItem;
+                if (mail != null && mail.Subject.Contains($"TrackingID{trackingId}"))
+                    toMove.Add(mail);
+            }
+
+            foreach (var mail in toMove)
+                mail.Move(dest);
+        }
+
+        private void MoveAllItemsFromFolder(Outlook.Folder source, Outlook.Folder dest)
+        {
+            var toMove = new List<Outlook.MailItem>();
+
+            foreach (object item in source.Items)
+            {
+                Outlook.MailItem mail = item as Outlook.MailItem;
+                if (mail != null)
+                    toMove.Add(mail);
+            }
+
+            foreach (var mail in toMove)
+                mail.Move(dest);
+        }
+    }
+}