Exchange 2007 Update Rollup 3 is out

Update Rollup 3 for Exchange Server 2007 has been released in the beginning of July 2007. It resolves issues that were found in Exchange Server 2007 since the software was released. This update rollup is highly recommended for all Exchange Server 2007 customers.
Note: Update Rollup 3 is a cumulative update rollup, and it replaces previous rollups, therefore you do NOT need to install previous rollups before installing this one. For a list of changes included in this update rollup see KB935999 (link below).

System Requirements

Supported Operating Systems: Windows Server 2003 R2 (32-Bit x86); Windows Server 2003 R2 x64 editions; Windows Server 2003 Service Pack 1; Windows Server 2003 Service Pack 2; Windows Server 2003 x64 editions
Note: Exchange Server 2007 must be installed prior to installing this update rollup, duh…
You must uninstall any interim update that has been installed on the Exchange server prior to installing this update rollup.
Note: Microsoft also offers a 32-bit version of this rollup (see links below). However it is only used for 32-bit editions of Windows Server 2003 SP1, Windows Server 2003 SP2, Windows Server 2003 R2, and Windows XP SP2 Exchange Server 2007 management tools, since Exchange 2007 32-bit version is NOT supported by Microsoft for production environments.
When you install the update please note that all required services are automatically stopped and then restarted, so there will be a short period of downtime.

Known issues

The most annoying issue you might come across when installing this rollup is that after the installation of Update Rollup 3 for Exchange 2007 is complete, users might not be able to log on to Microsoft Office Outlook Web Access, and instead they are redirected to a blank Web page that has a URL that resembles the following:
https://servername/owa/auth/logon.aspx?url=https://servername/owa&reason=0
The following event is logged in the Application log:
Event Type: Error
Event Source: MsiInstaller
Event Category: None
Event ID: 1024
Description: Product: Microsoft Exchange Server – Update ‘Update Rollup 3 for Exchange Server 2007 (KB935999)‘ could not be installed. Error code 1603. Windows Installer can create logs to help troubleshoot issues with installing software packages. Use the following link for instructions on turning on logging support: http://go.microsoft.com/fwlink/?LinkId=23127
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
The Setup Wizard for Update Rollup 3 for Exchange 2007 (KB935999) displays the following message during the installation of Update Rollup 3 for Exchange 2007:
Setup Wizard for Update Rollup 3 for Exchange Server 2007 (KB 935999) ended prematurely because of an error. Your system has not been modified. To install this program at a later time, please run the installation again.
This issue occurs if the %SYSTEMDRIVE%\ExchangeSetupLogs folder has been deleted, renamed, or moved after the installation of Exchange 2007. To resolve this issue, follow these steps:

1. If the ExchangeSetupLogs folder was renamed or moved, restore it to the root folder of the drive on which the operating system is installed.
2. If the ExchangeSetupLogs folder was removed and cannot be restored, create an empty folder that is named ExchangeSetupLogs in the root folder of the drive on which the operating system is installed.
3. Reinstall Update Rollup 3 for Exchange 2007.

Download Links

Update Rollup 3 for Exchange Server 2007 (KB935999):
On the page you‘ll find 2 links for the executables.
Exchange2007-KB935999-x64-EN.msp (30.4 MB) Exchange2007-KB935999-x86-EN.msp (27.1 MB)
Description of Update Rollup 3 for Exchange 2007 – 935999 http://support.microsoft.com/kb/935999