Hi Guys a customer with a 406ds on 3-2-17 would like to run Microsoft OCS 2007r2. The Avaya is a 406v1 & the low release is due to old Alchemy pots still being used on it. Microsoft do not list the Avaya IP Office as being supported but it does not hurt to ask. Remember the old days = 9 for an outside line & 0 for the operator training done.