Hello Is there a known step to upgrade all servers to service pack 1? Should I start from primary domain controller, secondary and then exchange and other servers or it is the other way? Thank you Attention: This message, including any attachment(s), is intended only for the use of the individual(s) to which it is addressed and may contain information that is privileged or confidential. Any other distribution, copying or disclosure is strictly prohibited. If you are not the intended recipient or have received this message in error, please notify us immediately by reply e-mail and permanently delete this message including any attachment(s), without reading it or making a copy. Any outgoing message has been scanned for possible harmful file(s) or script(s), but it is your sole responsibility to run detection tools as we won't guarantee the safety of message(s).