I have two Exchange 2007 SP1 HUB/CAS server with CAS server NLB configured.
also two Mailbox servers with CCR configured. Base OS for all Exchange servers is windows server 2008 entprise edition. All Exchange servers are installed with update Rollup pack 7. Now I am getting a warning event 1021 on HUB/CAS server 1. which states that "Exchange 2007 CAS cannot copy the OAB from the OAB share on Windows Server 2008-based Exchange 2007 CCR clusters". Now as per microsoft this is a known issue & this will get resolved with Rollup update pack 5.
Now, my query is that do we can install two rollup update simultaneouly
I have tried to install rollup update 5 (rollup update7 is already installed) in my POC lab but it will
corrupt OWA, due to which Exchange 2007 mailboxes can not be accessible through /exchange virtual directory.
And do we have any separate patch to resolve this event 1021
Kindly help for the same.