Why might you move back to HCL Domino?
Is your honeymoon period over with Microsoft and you plan to return to HCL Domino, or do you need a more secure customisable mail solution than Microsoft offers, or have you been attracted back to the latest features in HCL Domino 12? It is not uncommon for Microsoft to provide you favourable rates for 3 or 5 years and then at the end of these significantly increasing your next charges.