Microsoft has released Update Rollup 3 for Exchange Server 2007 Service Pack 2, which resolves issues that were found in Exchange Server 2007 SP2 . This update rollup is highly recommended for all Exchange Server 2007 SP2 customers
you can download the update here http://www.microsoft.com/downloads/details.aspx?FamilyID=c781326a-7b81-444d-9836-760fa1e3a28a&displaylang=en
---Cheers
Paddy