Today Microsoft we released the following update rollup for Exchange Server 2007: Update Rollup 4 for Exchange Server 2007 SP1 (KB952580)
Visit here to download information for Update Rollup 4 for Exchange 2007 SP1 - http://www.microsoft.com/downloads/details.aspx?FamilyId=8B492ED2-EA92-412F-A852-3AA1C58D9499&displaylang=en
The rollup is marked as “v2” in the file name i.e. Exchange2007-KB952580-v2-x64-EN.msp to account for the accidental release of v1 via Microsoft Update on 9th September. The rollup will be available via the download center link starting today and available via Microsoft Update starting 10/14.