MSExchangeIS Mailbox Event ID 1025

This is a warning I get frequently. What is causing it?

Event Type:      Warning
Event Source:      MSExchangeIS Mailbox Store
Event Category:      General
Event ID:      1025
Date:            6/7/2010
Time:            10:11:54 AM
User:            N/A
Computer:      MAIL
An error occurred on database "First Storage Group\Mailbox Database".
 Function name or description of problem: Restrict/SetSearchCriteria
Error: 1162 Warning: fail to apply search optimization to folder (FID 5-87403)   Retrying without optimization.

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Satya PathakLead Technical ConsultantCommented:
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