HiI created 2 node SCC mailbox cluster with Exchange 2007 SP1. I have installed the Update Rollup 5 for Exchange SP1. But there's no Default OAB. I checked the event logs but it is showing me no related errors obviously since the OAB does not exist at all. Any suggestions on how to make the server automatically create it?RegardsP.S. Sorry for double post

Dear customer: I have noticed that you sent a duplicate post, I have replied your first post in the following thread, please check it. http://social.technet.microsoft.com/forums/en-US/exchangesvradmin/thread/8057b4f8-a011-4b21-95ba-74571fe6f5bf Thanks for your cooperation. Rock Wang - MSFT

I solved the issue by creating the Default OAB manually. I don't know why it did not generate automatically. Anyways, after creating the Default OAB manually, I did tests for both OWA and Outlook 2007. Seems to be working OK. Best regards