Normally, you can enable Exchange Server cached mode support when you install Microsoft Outlook on users' machines. Unfortunately, they can easily disable it, since Outlook doesn't require users any special permissions to do so. However, you can enforce cached mode at the group policy level.
Prerequisites
The group policies I explain in this tip are only effective for Outlook 2003 clients. Furthermore, many of the group policy settings are only effective for new Microsoft Outlook profiles.
Microsoft Outlook group policy administrative template
Windows does not include Outlook-related group policy objects by default. So before we get started, you have to download an administrative template and import it into your effective group policy.
You can download a a self-extracting file that contains administrative templates for all the various Microsoft Office applications (Word, Excel, etc.). To enforce cached mode though, you only need the Microsoft Outlook template, OUTLK11.ADM.
Once you've downloaded the template, you need to import it:
The template is now imported into the Group Policy Editor.
Setting up the cached mode group policy
An extra group policy for mobile users
If you have mobile users in your organization, another handy group policy object is the Disallow on Slow Connections setting. If you enable this option, Microsoft Outlook will test the speed of its connection to Exchange Server. If it perceives a slow connection, only
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message headers will be downloaded rather than the entire message.
Outlook performs a speed test because just checking the rate of the computer's network adapter is not a reliable measurement of speed. For example, suppose a computer had a 10 Mbps network adapter connected to an ISDN modem. The network adapter would report that communications were flowing at 10 Mbps.
In actuality, communications would only be moving at 10 Mbps between the NIC and the ISDN modem. Communications between the ISDN modem and remote host, on the other hand, would flow at a maximum of 128 Kbps. If Outlook didn't perform its own speed test, it would never know that the connection was slow.
About the author: Brien M. Posey, MCSE, is a Microsoft Most Valuable Professional for his work with Exchange Server, and has previously received Microsoft's MVP award for Windows Server and Internet Information Server (IIS). Brien has served as CIO for a nationwide chain of hospitals and was once responsible for the Department of Information Management at Fort Knox. As a freelance technical writer, Brien has written for Microsoft, TechTarget, CNET, ZDNet, MSD2D, Relevant Technologies and other technology companies. You can visit Brien's personal Web site at www.brienposey.com.
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