How to stop sharing Calendar/Mailbox freely by user?

- Exchange 2000/2003 mixed
- Outlook2000/2003 mixed

I want users to stop sharing their Outlook calendar or mailbox which can be configured by users hands.
I want only administrators can permit the share of them by security settings.

We maintain group company with AD which contains few subsidiaries.
We have to stop information shareing by users between subsidiaries.

We have separate file, db, mail server, but Exchange servers are in same organization.
I would like to know how to stop Outlook sharing in same doman/organization.

Thanks.
kimakabaneAsked:
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SembeeConnect With a Mentor Commented:
Mailbox sharing is only possible within the same Exchange org.
You can only have one Exchange org per forest.

So if the users are in the same forest, then they will be able to share.
If they are in different forests, then they will be unable to share without third party tools.

Outlook 2000 users will be able to share across forests using Net Folders. That feature was removed in Outlook 2002 and higher.

Simon.
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SembeeCommented:
There is no technical way to stop users from sharing their content.
Microsoft operate on a principle that users can do what they like with their mailbox and the administrators can do nothing to stop them.

If you want to stop sharing, then you will have to get management involved, mandated as against company policy and have it made a disciplinary offence.

Simon.
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kimakabaneAuthor Commented:
Thanks Simon,

If we separate 2 business units with Forest, can we prohibit access mailbox each other?
However we have to implement MIIS2003 to share the GAL each other.
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