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Describe the differences in the permission model between Exchange 2003 and 2010

only a short answer if someone can provide it.
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Kindly check id this is what you are looking for

Exchange 2010 provides you a very very granular approach to each and every permission that you can think of in your Organization - this funda is called RBAC (Role Based Access Control)

Exchange 2003 on the other hand had a very simple approach, you'd have either everything or nothing in terms of being an admin who could do everything or view only admin, who couldn't perform even basic admin tasks.

I could flood you with articles on differences, but then i think you wanted to read our opinion by experience and not 100 pages of articles.

Exchange 2010 uses Role Based Access Control (RBAC), as opposed to the traditional Access Control Lists (ACL) of Exchange 2003.
RBAC allows you to assign permissions to users/groups in a much more granular fashion, and also means you don't have to edit the ACL of each object you need to modify.

Microsoft's own explanation:

A great summary of the differences can be found on this blog:
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Exchange 2003
- More of GUI based with simple tasks.
Exchange 2010
- Is based more on shell as even any action in EMC runs a shell command in the back-ground.

I guess you have Exchange 2003 so know a lot about it
Exchange 2010 has more Flexibility in pulling information and trying to get more out of Exchange.

Retention Policies and tags (In Exchange 2003 it was Mailbox Manager policy)
Email address policy and Accepted domain function
Exchange 2010 is ROle based (Mailbox, CAS, HUB, UM & EDGE)
HA and Site resiliency with DAG
Shell can give you almost everything or information you need
Transport Rules and Anti Spam agents

- Rancy
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