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  // For complete examples and data files, please go to https://github.com/groupdocs-search/GroupDocs.Search-for-.NET
  public void OpenFoundMessageUsingAsposeEmail(string searchString)
        {
            string myPstFile = Utilities.pathToPstFile;
            // Indexing MS Outlook storage with email messages
            Index index = new Index(Utilities.indexPath);
            index.OperationFinished += Utilities.index_OperationFinished;
            index.AddToIndex(myPstFile);

            // Searching in index
            SearchResults results = index.Search(searchString);

            // User gets all messages that qualify to search query using Aspose.Email API
            MessageInfoCollection messages = new MessageInfoCollection();
            foreach (DocumentResultInfo searchResult in results)
            {
                if (searchResult.DocumentType == DocumentType.OutlookEmailMessage)
                {
                    OutlookEmailMessageResultInfo emailResultInfo = searchResult as OutlookEmailMessageResultInfo;
                    MessageInfo message = GetEmailMessagesById(Utilities.pathToPstFile, emailResultInfo.EntryIdString);
                    if (message != null)
                    {
                        messages.Add(message);
                    }
                }
            }
        }

        private MessageInfo GetEmailMessagesById(string fileName, string fieldId)
        {
            PersonalStorage pst = PersonalStorage.FromFile(fileName, false);
            return GetEmailMessagesById(pst.RootFolder, fieldId);
        }

        private MessageInfo GetEmailMessagesById(FolderInfo folderInfo, string fieldId)
        {
            MessageInfo result = null;
            MessageInfoCollection messageInfoCollection = folderInfo.GetContents();
            foreach (MessageInfo messageInfo in messageInfoCollection)
            {
                if (messageInfo.EntryIdString == fieldId)
                {
                    result = messageInfo;
                    break;
                }
            }

            if (result == null && folderInfo.HasSubFolders)
            {
                foreach (FolderInfo subfolderInfo in folderInfo.GetSubFolders())
                {
                    result = GetEmailMessagesById(subfolderInfo, fieldId);
                    if (result != null)
                    {
                        break;
                    }
                }
            }
            return result;
        }