I got an exchange error 118 something about indexing. All of our outlooks clients were disconnected from the server. The information store services was still running, so I started and stopped the service; that still did not fix the problem. I then rebooted the mail server and it all came back online. All of the outlook clients got reconnected.
When I checked the event log all the events in that time frame are missing and I got one error that states: the exchange store database ... has been patched please backup the database. warning event 9524.
What caused this type of error?