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Throttling full offline Address Book downloads to limit the effect on a LAN in Exchange Server 2003
Article ID: 867623 - View products that this article applies to.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows XP and Windows Vista
You may find that periods of very high network usage occur when many Microsoft Outlook clients in your company try to download the offline Address Book at the same time.
This problem may occur if you have very large offline Address Books.
By default, every client request for a full offline Address Book download is served immediately, and the public store does not limit the number of concurrent full offline Address Book downloads that can occur.
For example, if a public store that supports 10,000 users receives 3,000 requests in one hour and the offline Address Book size is 100 megabytes (MB), the server must deliver 300 gigabytes (GB) of data. This traffic could potentially overload a 100-megabits-per-second (Mbps) local area network (LAN) for longer than ten hours. This traffic could potentially overload a gigabit-per-second LAN for longer than one hour.
In Microsoft Exchange Server 2003 Service Pack 1 (SP1), the administrator can override the default behavior and limit the bandwidth that is used by full offline Address Book downloads from a particular public store.
To turn on this feature in a public store server that is used for offline Address Book distribution, follow these steps.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
For more information about high network usage that can occur while Outlook clients download the offline Address Book, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/839826/ )High network usage occurs while Outlook clients download the offline Address Book from Exchange 2003 at the same time