Thanks for the inputs. We're going to be doing the 2010SP2 upgrade this weekend. Our configuration is 2 HUBT servers, 2 CAS servers in an array using a 3rd party NLB device, 4 MB servers in a DAG configuration with 3 servers with 2 active dbs each and a 4th server with a db copy of all dbs. Each MB server also has 2 copies of the active dbs from other servers. We also have 2 EDGE role servers in the perimeter. Our EDGE servers have TMG and Forefront Protection for Exchanage and to add to the protection we also have MS's Forefront Online Protection for Exchange (FOPE). When I get done with the SP2 update I'll post any issues that we see and the results. CAS and HUBT servers are Hyper-V VMs and all other servers are Dell PE610 and 710s.