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I've found that you can disable delegate access individually, on each client, through the Add-ins menu, under Exchange Client Extensions. However, we do not want any of our users to be able to use delegate access, so would like to disable it company-wide.

Does anyone know of a way to do this, either through Exchange or group policy?

Both Exchange and the Outlook clients are version 2007.

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I haven't tested this, but a regkey may work through GPO:

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I hadn't actually found that one yet, but it's not working for me - doesn't seem to have any effect at all. Anyone had success with it? – Dan Mar 1 '11 at 14:44

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