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Remote Exchange Server, Incoming EMail, and Ports

When an organization access an external (i.e. third party) Microsoft Exchange Server for their email and uses MS Outlook 2003/2007 email clients locally (with Calendar Sync), does the incoming email still use the standard POP3 port of 110 ? Or does it use some other port(s) instead of or in addition to port 110 ? A site needs to configure an edge router or firewall device of some sort to effectively scan incoming emails - and on occassion strip certain attachment types.  

TIA ...
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Incoming email will typically arrive on port 25 as smtp traffic.  pop3 port 110 would be the port your mail client uses to pull the mail from the server.
LGroup1Author Commented:
Yes, the Exchange server is actually hosted by a third party outside of the organization and the internal clients (for this smalll company)  are MS Outlook - so typically it would be POP3 at that stage. I am just not sure if MS Exchange along with MS Outlook use other ports given the additional functionality available (e.g. Calendar Sync, etc...).

if its an exchange connection, I think it uses TCP port 587...
LGroup1Author Commented:
Perfect, thanks !
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