Is there any consideration during service pack upgrade from sp1 to sp3 for Exchange 2007 on a windows server 2003 sp2? any known issues? any step by step guide? any pre-requirements? any risks? Thanks.

Hi ArashH, As I know you can update exchange 2007 sp3 directly. You might need to install Windows Installer 4.5 which will require a reboot. Some related thread and document for your reference: http://social.technet.microsoft.com/Forums/en/exchangesvradmin/thread/8c366225-7faf-469c-b16e-30f484a6716c http://technet.microsoft.com/en-us/library/ff607233(EXCHG.80).aspx Best Regards!Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.