|Source:||MSExchange Search Indexer|
|Message:||Failed to enable MDB %1 (GUID = %2) because its search index was in an unknown status (%3). Reset the index files by running the command ResetSearchIndex.ps1 in the Exchange Management Shell.|
This Error event indicates that the Microsoft Exchange Search service did not enable the specified mailbox database because its catalog has an unknown status (mentioned in the event description). The catalog or index files are located in the same directory as the mailbox database. The problem might occur when the index files are corrupted. Because of this error, online mode search may take a long time to return results for users who have mailboxes on the affected mailbox database.
To resolve this error, do one or more of the following:
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.