Written by Sam McGeown on 10/8/2010
Published under Microsoft
If you’re having trouble accessing OWA after updating Exchange 2010 with any of the Rollup packages, try this: Uninstall the update package from the Programs and Features control panel Download the package file directly from Microsoft, don’t use Windows Update Open a command prompt or PowerShell prompt as Administrator Navigate to the location of the package (.msp) and run from the elevated command prompt.