What ports does Exchange Server 2007 use on the LAN?

We are setting up some ACLs for communications between VLANs on the network.  I want to keep things as tight as possible and only loosen up if we have to.

Since we use an exchange server on our network, what ports have to be able to communicate with Exchange?  I am primarily interested in the ports needed for Outlook to communicate with Exchange.

Thanks!
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AustinComputerLabsCommented:
Here is an MS article that tells all the ports for MS products:
http://support.microsoft.com/kb/832017
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ashunnagCommented:
it is using port 135 + many dynamics ports for communications.
Dynamic ports range is 1024-6535.

Above ports for outlook to Exchange communication.
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ashunnagCommented:
find the detailed ports reference from this link:
http://technet.microsoft.com/en-us/library/dd789693(EXCHG.80).aspx
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