Outlook Web Access

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. Apparently when Windows update installs the package it doesn’t run it with the elevated privileges to write to the folder in the Exchange program files – why, I have no idea!

Outlook Web access is a fantastic tool for our company, providing on-the-go access to people’s mailboxes - which is of course secured by SSL and uses Forms Based Authentication. Internally, we have an intranet portal that allows us to access the various systems - one of which is OWA. One of the stipulations for this internal portal is that it is all Single Sign On using NTLM authentication integrated authentication. This is where the problem lies because enabling OWA with Forms Based Authentication over SSL disables Integrated Authentication.