It would need to be done at Exchange level, permssions granted to all users for read/write access and enabled as an Outlook address book.

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Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact.

After furious head scratching, modene1 asked:

| I have seen this done but am struggling to replicate:
|
| How do I setup a contact/address list on our exchange server such
| that all users can modify it and access it from their address list
| drop down/To box when creating emails?