As previously written in one of my earlier posts and on msexchangeteam.com, a pre-release version of Update Rollup 4 for Exchange Server 2007 Service Pack 1 (KB952580) was inadvertently made available to Microsoft Update, the Microsoft Update Catalog, and Windows Software Update Services (WSUS) servers for download and soon after taken offline again.
Now the final release of Update Rollup 4 for Exchange Server 2007 Service Pack 1 has been released. Fixes for the following issues are included (details in KB 952580).
Direct link to download:
If you by accident have installed the pre-release version of Update Rollup 4, you should uninstall it before installing the final version. Read more on the MSExchangeTeam blog: