The \MSExchange IS Mailbox(*)\Slow FindRow Rate performance counter is returning large values to third-party monitoring software. The threshold should not be more than 10 for any specific mailbox store.
Large values indicate that applications are crawling or searching mailboxes and that server performance is being affected. These applications may include desktop search engines, customer relationship management (CRM), or other third-party applications.
In this case, a corrupted index catalog for the mailbox database is logging the following event in the Application log:
Log Name: Application Source: MSExchangeIS Mailbox Store Date: Date Event ID: 9877 Task Category: Content Indexing Level: Error Keywords: Classic User: N/A Computer: Server FQDN Description: Content Indexing function 'CISearch::EcGetRowsetAndAccessor' received an unusual and unexpected error code from MSSearch. Mailbox Database: Database Name Error Code: 0x80041606
To resolve this issue, follow these steps:
Open the Microsoft Exchange Management Shell, and then locate the following folder in the location where Exchange is installed:
Microsoft Exchange Server 2010 Standard, Microsoft Exchange Server 2010 Enterprise, Microsoft Exchange Server 2010 Service Pack 1, Microsoft Exchange Server 2010 Service Pack 2, Microsoft Exchange Server 2007 Standard Edition, Microsoft Exchange Server 2007 Enterprise Edition, Microsoft Exchange Server 2007 Service Pack 1, Microsoft Exchange Server 2007 Service Pack 2, Microsoft Exchange Server 2007 Service Pack 3