Open ports for Exchange 2003


Which ports on the firewall have to be open in order for Exchange 2003 (part of SBS ) to work?

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ZadkinConnect With a Mentor Commented:
It depends,  for example with or without Outlook Web Access.  

Most ports are described in
E-mail     25    Allows incoming and outgoing Simple Mail Transfer Protocol (SMTP) traffic so Exchange can send and receive Internet e-mail.

But POP3 110 can be used and is not described.
Jeffrey Kane - TechSoEasyConnect With a Mentor Principal ConsultantCommented:
Zadkin... I don't recommend using the POP3 service on an SBS (this would be for remote users to use POP3 to gather their mail from the Exchange server) because Outlook Web Access is available.  The POP3 Connector, if used, for retreiving mail from an ISP's server does not require port 110 to be open.

However, in order for Outlook Web Access to function, port 443 must be open as well.

You are most probably right.  I used POP to allow remote access for mobiles with POP clients.  
Nowadays I have a mobile with IMAP,  but I don't think it is worth the configuration effort.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
You shouldn't need either if its Windows Mobile... because Exchange is integrated with activesync.

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