Cached Exchange Mode in Outlook

5 pts.
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Cached mode
Offline store (.ost)
Outlook
I am trying to enable cached exchange mode on my laptop so I can access Outlook 2003 while offline, but the option is greyed out in account settings. I cannot find any reference to this problem searching this forum and MS Help is of course no help at all. We use Small Business Server rather than full blown Exchange but I cannot find anything about such a restriction either. I have reinstalled Office and deleted my profile and recreated it. I have also looked at the settings for Exchange on the server and cannot find anything that could be related to this problem. I can't select Work Offline from the file menu either which I thought allowed the creation of an OST in previous versions of Outlook. Any suggestions would be appreciated. Phil Doomen
ASKED: April 7, 2008  11:28 PM
UPDATED: April 8, 2008  1:38 PM

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Cached Exchange Mode is a GREAT feature of Outlook 2003. As you said it makes a local copy of the Exchange Mailbox on the local machine.

This does so much more than just enabling you to work when you are off the network. Enabling this reduces network traffic, creates faster responds time for the Outlook client (especially with large attachments), being able to use the Junk E-mail Filter and being able to work off-line.

When you create a new profile in Outlook 2003 Cached Exchange mode is enabled by default.
When you upgrade from a previous Outlook version with an Exchange mailbox to Outlook 2003 Cached Exchange mode is disabled by default.

This makes it really hard to determine and control remotely whether your clients have Cached Exchange Mode enabled.

<b>Enabling/Disabling Cached Exchange Mode can be controlled though the registry. This allows you to enable/disable it with a simple logon script to create a standard in your organization without the need of forcing the recreation of the entire profile at start-up or visit each client.</b>

Cached Exchange Mode is controlled by the following key;
[HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\<ProfileName>\13dbb0c8aa05101a9bb000aa002fc45a]

00036601 (REG_BINARY)

enabled value; 84 01 00 00
enabled with Public Folders/Favorites: 84 05 00 00
disabled value; 04 00 00 00

Please note that the “00036601″ registry key stores more connection settings that just wether or not Cached Exchange Mode is enabled. The values above are taken from a new mail profile with only the Cached Exchange Mode setting changed. If you’re going to deploy this registry key I recommend taking the value from a properly configured machine for your environment

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