Site A: 2 MBX only Exchange 2010 Servers (SP1 Rollup 6) 2 CAS/HT Exchange 2010 servers (SP2 Rollup 1) running NLB. 3 DCs of which 2 are GCs We are adding a new site shortly for a new office. This will only have a single DC in it. Is there anything I have to do for the Outlook clients in that office to work, or will they connect to the CAS array in Site A? Thanks! :-)