private void Clone(
ICW <Outlook.MAPIFolder> folder,
Outlook.AppointmentItem source,
string categories)
{
using (var item = source.CopyTo(folder.Ref, Outlook.OlAppointmentCopyOptions.olCreateAppointment).AsCW())
{
item.Ref.Subject = _env.UserName;
item.Ref.Categories = categories;
item.Ref.Save();
}
}