Event ID - 1239

Event Id1239
DescriptionEnumeration of numberOf entries for the ACL of folder folderName in database "databaseName" failed with error %5, and took an abnormally long time (numberOf seconds) to do so. This latency may be indicative of the folder having too many child folders with differing access rights. It may also be indicative of performance problems with your hardware.
Event InformationAccording to Microsoft:
This problem may occur if all the following conditions are true:
You have a public folder structure where many child public folders are created under a single parent public folder.
Each child public folder has its own access control list (ACL) entries defined.
When each child public folder has its own ACL entries defined, every time that the Exchange 2003 computer receives a new public folder replication message, the ACL for the parent public folder must be evaluated to determine which users have rights to see the changes to the parent public folder. If the parent public folder has a large discretionary access control list (DACL) entry, it may take a long time to update the view for each public folder subscriber.
Note The DACL for the parent folder is made up of the sum of the DACLs of all the child public folders.
If you have many child public folders under a single parent public folder, and if each of those child public folders has its own ACL defined, you may have many megabytes (MB) of DACL data that must be parsed. This data must be parsed so that the display can be updated for all the public folder subscribers every time that a public folder replication message is received.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem.
Reference LinksUsers experience a slow response from an Exchange 2000 Server public folder server

Users experience a slow response when they access public folders on a computer that is running Exchange Server 2003

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