Question

Is it possible to add different items to a mail item custom context menu by inspecting the contents of the item?
For instance, only add the item if the subject line contains "IMPORTANT".

Answer 1

This seems to work.

void Application_ItemContextMenuDisplay(Office.CommandBar CommandBar, Outlook.Selection Selection)
    {
        foreach (Outlook.MailItem m in Selection)
        {
            if (m.Subject.Contains("IMPORTANT"))
            {
                DeliveryFailureButton(CommandBar, Selection);
                break;
            }
        }
    }

    void DeliveryFailureButton(Office.CommandBar CommandBar, Outlook.Selection Selection)
    {
        Office.CommandBarButton btn = CommandBar.Controls.Add(
              Office.MsoControlType.msoControlButton,
              missing, missing, missing, true) as
              Office.CommandBarButton;
        btn.Caption = "Move to IMPORTANT messages";

        btn.Click += (Office.CommandBarButton Ctrl, ref bool CancelDefault) =>
        {
            string msg = "CRM Records
";

            foreach (Outlook.MailItem item in Selection)
            {
                if (item is Outlook.MailItem)
                {
                    var mitem = item as Outlook.MailItem;
                    msg += "
" + MoveToImportant(mitem);
                }
            }

            MessageBox.Show(msg);

        };
    }

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