After upgrading from a windows server 2003 to a 2011 sbs server with exchange. The network seams to run much slower. Programs seam to lag when opening them now. The new server has 4 times the specs of the old server. We are running one very old program on the old server so it is still hooked up. Would that be causing an issue? Nothing else in the network has been changed. There are 20 to 25 clients in the building. It is a CPA firm so they run lots of tax software.