hi guyi note that exchange 2003had afront and backend server, to protect the exchange;it also allow configure as front/back end function in exchange 03 via EMSbut,in exchange 2007,it call as hub transport(can i call it as front end?please corrent me if i wrong)How i can move my hub transport from my exchange box?here is what i have AD server DNS server exchange 2007 box;call as Ex03(i install all the exchange service in this single box) now we would like to : setup a tow new exchange box(call as Ex01 and Ex02), this 2 box only act as send/ receive email and serve user(OWA or outlook) the mailbox will remain to my exchange box call as Ex03. question is : can i just simply setup tow exchange box with install only hub transport service with this 2 of box? disable the hub transport in my EX03 box, and point the hub trasport to Ex01 and Ex02? please advice thank you

Hi, Front-end server is known as a Client Access Server in Exchange 2007 and it handles non-MAPI requests from clients like OWA, POP3, IMAP, Outlook Anywhere, ActiveSync, Availability service, and Autodiscover services while MAPI request (Outlook) directly goes to Mailbox server. Hub Transport server is responsible for routing emails in Exchange organization. References: Server Roles http://technet.microsoft.com/en-us/library/bb124935.aspx Understanding Exchange Server 2007 server roles http://msexchangeteam.com/archive/2006/09/12/428880.aspx Hub transport servers areautomatically load balanced in an Active Directory site so no need to configure anything after installing it but for CAS servers, you need to configure NLB (Network Load Balancing) cluster. You can check below articles written by Henrik to configure NLB cluster on your new servers (Ex01 and Ex02) with CAS & Hub Transport roles. http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part2.html http://www.msexchange.org/articles_tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part3.htmlOnce these two servers are set then you can configure internet mail connectorwith these new hub trnasport servers and uninstall CAS & Hub trnasport server roles from your EX03 box.Amit Tank || MVP - Exchange || MCITP - Exchange 2007 || http://ExchangeShare.WordPress.com

In Exchange 2007, the tasks of Front-end is done by two servers, HUB transport server, which takes care of mail transport part and CAS server which takes care of Access part(OWA, Outlook Anywhere etc).Ex03 is going to be your Mailbox server, so install Mailbox server role in it.Ex01 & Ex02 are going to take front-end server tasks of Exchange 2003, so they can either have CAS and HUB on individual servers or on both of them.The advantage of having both the roles in Ex01 and 02 is that you get redundancy in case one server fails, while your mailflow(both internal and external) will still work and your mailbox access too.Do not put the HUB for internal mailflow as there is a builtin load balancing mechanism for internal mail flow in case of multiple HUB servers.+Ravi

is very useful information for me thx!

Ravi-Shankar said: In Exchange 2007, the tasks of Front-end is done by two servers, HUB transport server, which takes care of mail transport part and CAS server which takes care of Access part(OWA, Outlook Anywhere etc).Ex03 is going to be your Mailbox server, so install Mailbox server role in it.Ex01 & Ex02 are going to take front-end server tasks of Exchange 2003, so they can either have CAS and HUB on individual servers or on both of them.The advantage of having both the roles in Ex01 and 02 is that you get redundancy in case one server fails, while your mailflow(both internal and external) will still work and your mailbox access too.Do not put the HUB for internal mailflow as there is a builtin load balancing mechanism for internal mail flow in case of multiple HUB servers.+Raviwhich mean if i need a redundancy i need resetup my exchange?coz now my exchange(ex03)is all-in-one.

cheehoong said: which mean if i need a redundancy i need resetup my exchange?coz now my exchange(ex03)is all-in-one. Hi,No, you can just remove Hub & CAS server roles from Ex03 server. Refer below article while removing individual roles (Hub Transport role removal is bit tricky). How to uninstall Exchange Server 2007 and individual server roleshttp://searchexchange.techtarget.com/generic/0,,sid43_gci1281195,00.htmlTo configure normal Exchange deployment with Redundancy & High Availability we need minimum 4 servers. 2 serversfor Clustered Mailbox server roles (either CCR or SCC type of clustering) and two for CAS+HUBon NLB cluster because...- You CAN NOT put any other roles on Clustered Mailbox server roles.- You CAN put Hub Transport server roles on CAS - NLB cluster servers.High Availabilityhttp://technet.microsoft.com/en-us/library/bb124721.aspxAmit Tank || MVP - Exchange || MCITP - Exchange 2007 || http://ExchangeShare.WordPress.com

hinow i get the picture!so it is not a recommend uninstall hub transport, and trasnfer it to 2 of CSA server rite?

Ok, let's come from generic view to particular Hub transport server role.You can remove Hub transport server from Ex03 and move it to NLB CAS servers because it is supported in Exchange 2007 SP1 but don't configure internal routing distribution of mail through NLB.Below article will make you more clear on the deployment options of Hub.Deployment Options for Hub Transport Servershttp://technet.microsoft.com/en-us/library/bb124398.aspxNetwork Load Balance for HUB & CAS - Exchange 2007http://exchangeserverinfo.com/2008/03/20/network-load-balance-for-hub--cas--exchange-2007.aspxAmit Tank || MVP - Exchange || MCITP - Exchange 2007 || http://ExchangeShare.WordPress.com