Michigan state workers were unable to access the state network and their e-mail Monday morning after a systems upgrade to the government’s active service directory knocked out several servers.

Officials thought the overnight upgrade had been successful, but when government employees came to work at 8 a.m., they couldn’t access their e-mail or their saved files on the shared network. Service was restored two and a half hours later when the state was forced to revert to the old, still active directory. The upgrade has been indefinitely postponed.

The computer outage was one of the biggest, longest and most widespread in the state’s history, according to Kurt Weiss, spokesman for the Michigan Department of Technology, Management and Budget.

The state has begun an after-action analysis of the outage’s cause and its impact on the state government. Those findings will be made public in the future, Weiss said.

Matt Williams  |  Associate Editor