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Event ID: 490 Source: ESENT

<process> (<PID>) An attempt to open the file "<file>" for read / write access failed with system error <system error code> (<hex error code>): "Access is denied. ".  The open file operation will fail with error <operation error code> (<hex error code>).
I had this problem for a while, requiring me to manually mount the stores. It started unexpected one day. I found that the Anti-virus program scanning the MDBDATA dir in Exchange caused the problem. Once that was excluded, the error went away. One of the AV updates must have changed its behavior.
- System error code: 5 - See the link to "Error code 5".

See the link to "EventID 490 from source ESE98" for further details on this event.

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