On Monday, July 9th and July 10th, a small subset of users were unable to get their Outlook client to connect with the Exchange servers. The problem is resolved.

The address book service on one of the CAS servers failed to start Restarting it resolved the issue. Monitoring on both Sitescope and the F5 load balancer will keep this from being an issue again.
Root_Cause: During a reboot from a Windows Update some Exchange services took longer than normal to start. The address book service gave up waiting for the other services to start and just did not start.

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