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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
Exchange Server online defragmentation against the information store databases starts immediately after information store maintenance tasks have been completed. By default, the online defragmentation process runs for a minimum of fifteen minutes and it only runs for up to one hour after the information store maintenance scheduled window time. You can change these times by editing the registry.
NOTE: If information store maintenance does not complete any tasks against the information store databases and a previous online defragmenation finished in full, online defragmenation does not run.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To configure the length of time that online defragmentation runs after the information store maintenance window: