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Ozannes

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Exchange 2003 / 2007 Routing Question

We have two organisations that currently reside within a single Windows 2003 AD Forest in two seperate domains. Within Domain A there is a Exchange 2007 server and within Domain B there is an Exchange 2003 server. These servers reside within the same Exchange organisation in two sites and are linked via a routing group connector. Each server has seperate site specific SMTP connectors to Mimecast and handle there own email. All PC's are using Outlook 2003 for connectivity. As there is a single server for each company these servers are gateways and mailbox / PF servers.

The companies are splitting so we have had to build a new Windows 2008 AD forest. Within this forest is a new Windows 2008 and Exchange organisation on an Exchange 2007 server. We have to move all of the users and mailboxes from Domain B into the new forest. Once the migration of all systems are complete the links between the companies will be broken and the existing forest cleaned up. However this clean up wont happen until several weeks after the Exchange migration has happened

I have tested the use of the Ex2007 move-mailbox cmdlet and will be using this to migrate the mailboxes to the new server / Org. I was planning on doing an Outlook Public folder export / import via a PST file to handle the public folder user data. However I have concerns about some of the system PF's specifically the Free / Busy information. I cannot see how to migrate this information and I'm not sure what the impact will be for the users. Can you explain?

I also have a question with regards to message routing. Once the mailboxes are moved into the new Forest staff in Domain A will still need to email people in the new forest. However as the old server from Domain B will still remain in the short term how do i stop Domain A's server trying to send messages to Domain B instead of the new server in the new Forest? What is the easiest / best method of overcoming this issue. Do I just have to have to uninstall Exchange from Dmain B or is it as simple as removing the routing group connector, changing the authorative domains for the organisation or something else.....

Many Thanks
Tony

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ARE71

Are you looking at sharing free busy info between the orgs until you split them?
If so you could start be looking at the Interorg replciation tool
http://www.microsoft.com/downloads/en/details.aspx?familyid=e7a951d7-1559-4f8f-b400-488b0c52430e&displaylang=en

Worth reading this as its is really a 2003 tool...
http://exchangeserverinfo.com/2008/02/28/configuring-interorg-replication-tool-for-replicating-the-public-folder--schedule-free-busy-between-the-forests.aspx

Of course Quest etc make tools for this sort of thing as well ;-)

In Exchange 2007 the availablity service provides the free busy functionality for Outlook 2007 / 2010 and OWA clients
http://technet.microsoft.com/en-us/library/aa998820(EXCHG.80).aspx
Public folders are only needed for pre-2007 Outlook clients and obviously if you are using then to store existing data.

I wouldn't worry too much about migrating the Free/Busy as the Availability service will read it from the mailboxes on Exchange 2007 and above. Like what ARE71 said...

As for the message routing, you either need to get rid of those mailboxes and convert them into Contacts so the messages go out via the internet or create contacts with bogus address like @e2k7.domainB.com and then create a connector to send everything with that address space direct to the e2k7 server, then you will also have to add these @e2k7.domainb.com e-mail addresses to everyone in the new Org. That's why it is probably easier to just get rid of domainB so all messages to this domain go out to the internet and are routed from there.
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ASKER

Many thanks for the info I'll take a look at the inter org replication tool.

In terms of the availability service I thought that this was only for Outlook 2007 and as we are using 2003 it wouldnt be used.

Domain B has a number of other servers (non Exchange) in it which cant be got removed immediately as they are being accessed via SID history from users in the new forest. So the domain iteself cannot be removed.

However based on your reply I assume that the only way of ensuring Domain A can still email the new forest is to uninstall Domain  B Ex2003 server and remove that site. This would mean all users in Domain A would send message via our normal internet bound SMTP connectors to Mimecast?
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MegaNuk3
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Many Thanks for the advice I like the idea of simple so will be uninstalling the old server, site etc.
Thanks for the points.
Be careful about Outlook cached entries for your users in Domain A cause if they try and send to an old cached entry for someone in Domain B they will get a nice NDR, so it might be worth having some Contacts or stub mailboxes in your AD with X500 addresses to stop your users in Domain A getting NDRs or you can tell them not to us cached entries for for Domain B users, but we all know users never listen... ;-)
If you can get away with it use Group policy to turn off the Outlook Autocomplete during the migration.
Losing autocomplete will make lots of users very angry, at least that's what normally happens in the places I have worked... ;-) Cause the users normally don't have everyone they send external mails to in their Contacts...