System unavailable message appears in Exchange Server 2007 after the ForeFront installation

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Hello Folks,

I’ve worked in a customer that started to get the system unavailable message message in all the webservices after a ForeFront installation.

Some of the symptoms:

  • Three of the Application Pools on the IIS Services manager are stopped and we cannot start them
  • OWA, Autodiscover, OAB returns the same error message: System Unavailable
  • Event ID 2268 and 2274 with source W3SVC-WP

Then, what’s the problem? How can I solve it? Here is the Microsoft KB to solve this issue:

Best Regards,
Anderson Patricio

Written by Anderson Patricio

Anderson Patricio is a Canadian Exchange Server MVP and MCSM (Solutions Master) and he contributes to the Microsoft Community with articles, tutorials, blog posts, forums and book reviews. He is a regular contributor at, and (Portuguese).