The latest update for Exchange Server 2007 SP1 was released by Microsoft yesterday.
As usual, a number of issues are fixed – a couple of highlights:
955989 (http://support.microsoft.com/kb/955989/ ) The SPN registration of a cluster fails, and Error event IDs 1119 and 1034 are logged in an Exchange Server 2007 Service Pack 1 environment
954197 (http://support.microsoft.com/kb/954197/ ) Exchange 2007 CAS cannot copy the OAB from the OAB share on Windows Server 2008-based Exchange 2007 CCR clusters
Happy patching :-)