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Event ID: 491 Source: ESE
<process name> (<process id>) An attempt to determine the minimum I/O block size for the volume "<name>" containing "<file name>" failed with system error <error code>: "<error message>". The operation will fail with error <error code>.
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Modifying the default permissions on Exchange 2000 Server and Exchange 2003 Server mailbox stores and public folder stores can cause this problem. See ME328229 and the link to "Working with Store Permissions" for details.
As per Microsoft: "This issue may occur if you do not have the appropriate permissions to the Mdbdata folder to mount the mailbox or the public store". See ME290215 and ME823022 to resolve this problem.
See the link to "EventID 491 from source ESE98" for additional information on this event.
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|Links: ME290215, ME328229, ME823022, EventID 491 from source ESE98, Working with Store Permissions|
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