First, co-existence should be no issue. We had some silly telephony stuff that forced us to keep an Exchange 2000 server around for a lot longer than we planned (its still here). It hums along with two user accounts on it and everything else is 2007.
As for your infrastructure, let me see if I understand you correctly. You have multiple AD sites connected by some sort of WAN link You have Exchange mailbox servers at multiple sites You have FE servers at multiple sites (converting to CAS) You are running DNS RR for external FE addresses for redundancy This sounds like a good setup, but I think your DNS RR for OWA wont work like you want it to in 2007. I believe that the autodiscovery service will always re-direct your OWA users to the CAS server closest to their mailbox, so the remote-site OWA server wont actually do much except harass folks logging into it and point them to the local-site OWA server and have them re-login. This would create redundancy if the local-site OWA server was down for some reason, but it can frustrate users a bit when they get re-directed and have to login a second time. Also I think Neil was right, having your CAS as a HT wont hurt it, but I don't think it will really see a lot of action. Good luck in your install -Troy -----Original Message----- From: Davies,Matt [mailto:[EMAIL PROTECTED] Sent: Thursday, September 18, 2008 6:44 AM To: MS-Exchange Admin Issues Subject: RE: Exchange 2007 roles There is a good chance it could increase to around 50 users, and they are pretty heavy on their use of email. I'm still old school and like separate roles. We will be implementing as Virtual Machine and replicating to one of our other sites, so we can bring it back quickly, especially when considering database portability within exchange 2007, as long as I have another exchange 2007 box somewhere OWA, and RPC over HTTP are the only critical applications, that the CAS box will be needed for, these are supported via FE boxes in 2 different locations at the moment, so installing another exchange 2007 box in the other location should not be a problem. These provide some redundancy via a round robin DNS entry. What are the implications associated with coexistence of exchange 2003 and 2007 ? It's not something I have been able to find a lot of information on ? OWA is round r Thanks Matt From: Neil Hobson [mailto:[EMAIL PROTECTED] Sent: 18 September 2008 14:22 To: MS-Exchange Admin Issues Subject: RE: Exchange 2007 roles For just 20 users you can put the mailbox, HT and CAS roles all on a single server. I can't see the point of implementing a single mailbox server with two HT servers for redundancy since if the mailbox server dies it's game over until you get that sorted. Also, if you need high availability and you also use OWA, EAS, POP, IMAP, etc, you may need to look at making the CAS role redundant via NLB, hardware load balancing, etc. Introducing E2K7 at this point means you could be in a coexistence state for some time if you're not planning on upgrading the other sites. Are you prepared for that? From: Davies,Matt [mailto:[EMAIL PROTECTED] Sent: 18 September 2008 13:31 To: MS-Exchange Admin Issues Subject: Exchange 2007 roles All, I'm hoping that I can borrow the collective intelligence of the group, to help me with this. At the present moment we have a exchange 2003 server as a back end and another as a front end/bridgehead box with both supporting around 20 users, There are also other exchange servers within the exchange org, on other sites. Due to what looks like windows issue the backend server blue screens every 4 hours. Rather than continuing to try and fix the problem, which having spent 16 hours on it so far is not getting me anywhere, I was thinking about deploying exchange 2007. Hence my question about exchange 2007 roles, and which should be used where, as far as I can see the best options is to create the following. 1, Create a new exchange 2007 server, with Hub transport and client server roles. 2, Create a new exchange 2007 server with the mailbox server role and possible add hub transport for redundancy. Does anyone see any problems with this or have any comments ? Thanks Matt ____________________________ Matt Davies Director of International IT Operations General Atlantic 83 Pall Mall London SW1Y 5ES Tel: +44 207 484 3203 Fax: +44 207 484 2803 Mobile: +44 777 559 4265 ____________________________ ____________________________________________________________ This e-mail (including all attachments) is confidential and may be privileged. It is for the exclusive use of the addressee only. If you are not the addressee, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please erase all copies of the message and its attachments and notify us immediately at [EMAIL PROTECTED] Thank You. ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
