I had a problem at one of my customers today. Suddenly they told me that OWA had stopped working.
When I tried it it started loading but it just stopped with the this URL:
After some searching I found this from KB935490 about Roll-Up Fix 2:
When you install Update Rollup 2 for Exchange 2007, you experience the following symptoms:
After the installation of Update Rollup 2 for Exchange 2007 is complete, users cannot log on to Outlook Web Access. In this scenario, the users are redirected to a blank Web page that has a URL that resembles the following:
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 2 for Exchange Server 2007 (KB935490) 8.0.711.2’ 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 2 for Exchange 2007 displays the following message during the installation of Update Rollup 2 for Exchange 2007:
Setup Wizard for Update Rollup 2 for Exchange Server 2007 (KB 935490) 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.
Note The %SYSTEMDRIVE% variable represents the root directory of the drive on which the operating system is installed. For example, %SYSTEMDRIVE% might represent drive C.
To resolve this issue, follow these steps:
If the ExchangeSetupLogs folder was renamed or moved, restore it to the root folder of the drive on which the operating system is installed.
Note The ExchangeSetupLogs folder may have been removed, and you may be unable to restore it. In this situation, create an empty folder that is named ExchangeSetupLogs in the root folder of the drive on which the operating system is installed.
Reinstall Update Rollup 2 for Exchange 2007.
I simply downloaded Roll-Up Fix 6 and installed it.