I tried to search in order to find which network ports I need to open in my firewall in order for Outlook to connect to Exchange 2007. I monitored the logs and found that outlook use the below: TCP2466,2485,135,42869 But then I noticed that it is using port 42868? So, is there any set of standard ports that Outlook 2003/2007use to connect to Exchange 2007? P.S. I have two servers: Mailbox/hub transport and CAS

Hello, Most of the ports are statics except some like Client Access server to Exchange2007 Mailbox server uses random RPC ports to get some information and in that case you can configure RPC dynamic port allocations to work with firewalls. Check below article for further information on Ports used in Exchange 2007 and controlling port usage. Data Path Security Reference http://technet.microsoft.com/en-us/library/bb331973.aspx How to configure RPC dynamic port allocation to work with firewalls http://go.microsoft.com/fwlink/?linkid=3052&kbid=154596 BTW, what you are trying to do by opening firewall ports? If you are looking to configure/publish some feature like Outlook Anywhere on internet then it is recommended to use application aware firewall like ISA 2006. Publishing Exchange Server 2007 with ISA Server 2006 http://technet.microsoft.com/en-au/library/bb794751.aspx Using ISA Server 2006 with Outlook Anywhere http://technet.microsoft.com/en-us/library/bb331965.aspx

I agree with Amit, you should only need to open port 443 on your firewall for Outlook Anywhere users. Of course you will also need to look at a UC Certificate from Verisign or DigiCert.

I need to know the ports which outlook need to connect directly to Exchange 2007 in order to setup rule to limit our brance office which is connected directly to our main office via a dedicated line.

Hi, Please refer to the below link article to troubleshoot this issue. http://support.microsoft.com/?kbid=270836 Thanks Allen

Dear All,For the Firewall of Windows Server 2003 R2 Sp2,So, which service port must opened for the Outlook 2003 and Exchange Server 2007 SP1 ?Many thanks !Edward.