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Mailbox Cache Idle Limit has been set

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]  

Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether the Mailbox Cache Idle Limit is present:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem

If the Exchange Server Analyzer finds the Mailbox Cache Idle Limit registry entry present, a non-default configuration message is displayed.

Exchange Server allows size limits (quotas) to be set on mailboxes. Quota settings are stored in the Active Directory® directory service, and the Exchange server periodically reads the information in Active Directory to determine whether any changes were made to these limits. Exchange Server caches this information for a period of time, after which it re-reads the information in Active Directory.

The Mailbox Cache Age Limit setting and the Mailbox Cache Idle Limit setting control how long the entries in the mailbox information cache survive. An item will be removed from the cache if it has been in the cache longer than the time (in seconds) in the Mailbox Cache Age Limit setting. An item will be removed from the cache if it is not used for the time (in seconds) in the Mailbox Cache Idle Limit. The default values for these settings are 7,200 seconds (120 minutes) for the Mailbox Cache Age Limit setting and 900 seconds (15 minutes) for the Mailbox Cache Idle Limit setting. The value of the Mailbox Cache Idle Limit setting should not be more than the value of the Mailbox Cache Age Limit setting.

importantImportant:
This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem.

  3. In the right pane, locate and delete the Mailbox Cache Idle Limit value.

  4. Close the registry editor and restart the Microsoft Exchange Information Store service for the change to take effect.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986).

For more information about the Mailbox Cache Age Limit registry value, see the Knowledge Base article 327378, "XADM: Exchange 2000 Mailbox Size Limits Are Not Enforced in a Reasonable Period of Time; Fix Requires Exchange 2000 SP3" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=327378).

 
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