On December 3, around 12 PM (12:00) the Application Log of Event Viewer was filled with dozens (if not hundreds) of these Event ID 1025 Warning messages: An error occurred on database "First Storage Group\Mailbox Database". Function name or description of problem: SLINK::EcUpdate Error: 0x8004010f Reading another discussion about this error, I noticed that it was recommended to run ISINTEG with the -FIX and -TESTS parameter. Preparing to do this tomorrow, I noticed, however, in a Technet article concernant isinteg that the -FIX option: "[This option] tests and corrects errors in the information store that you specify. Therefore, it is best to use this option only when instructed to do so by a Microsoft Customer Support Services representative." Do you think my situation, as I described it, warrants running first, perhaps, the eseutil /g and then the isinteg commands? This is what I have for ISINTEG syntax: isinteg -s servername -fix -test rowcounts isinteg -s servername -test alltests #############################3 Note: - There have been no more of these errors for 1 week. - Email functions normally in every respect (or at least for the components that we use). Please advise. Thank you in advance!