Exchange 2010 Issues routing when a server is offline or down

Here is my issue I will try and explain it as bast as one can. My client has 3 Exchange servers two of them are Exchange 2010 and one is Exchange 2003.

Each server is in is own location, the main server that all mail is set to is the Exchange 2003 server and we plan to upgrade it as soon as we can, then if the email needs to go to one of the other sites depending on the mailbox and what server it is on it been working great till yesterday, All servers are within the same AD Domain,

Yesterday one of the Exchange 2010 servers had a issue with memory issues and was down. Now the other server Exchange 2010 in a different location mail was not going though to it, I would have thought this would not have been a issue, But it was, I need to know why for my customer and myself.

My main question here is what needs to be changed if one server is down or offline what do I need to change so that if a Exchange 2010 server is down or Internet that mail would still be able to flow to the other server if there was a outage, Since other mailboxes for different users were on in. I

I hope my question is clear

Thanks
Steven
sdetraffAsked:
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BusbarConnect With a Mentor Solutions ArchitectCommented:
that is fine, but for multiple RGs you need to disable link state updates.

looks like something with the email routing but it is not clear from my side, but you know the cause now so you might be able to start troubleshooting it.
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BusbarSolutions ArchitectCommented:
Well that belongs way back to how message routing is done in 2003 and how different it is done in 2010, in 2003 it relied on the routing groups concepts which means that each group of 2003 servers that are connected with high speed network could be placed in their own routing groups.

in 2010 this is changed and RGs are removed, now mail delivery relies on the active directory site and services.
to route the emails between 2003 and 2010 we create a routing group connector because from 2003 point of view it sees all 2010 servers as if they are in single routing group, servers defined in the RG are the enter and exit points for emails between the 2003 world and 2010 world.

from what I can see it looks that the 2010 servers that had the RAM issue was defined in the RG that connects the 2003 with the 2010 so when it was down, no mail flow occured

to solve it, create a new RG between the 2003 and the other 2010 server, but watch from link state islands, this can be solved using supress link state updates
http://technet.microsoft.com/en-us/library/aa996728.aspx
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sdetraffAuthor Commented:
Ok I think I get what you mean, But the other Exchange 2010 Server was up Internet was up and still no mail would flow till the second Exchange Server came back online.

I had setup 2 routing groups one for each Exchange 2010 server so that the Exchange 2003 server could send mail to each one, was this not the correct thng to do?
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sdetraffAuthor Commented:
The thing is, I had thought that if one exchange 2010 server was down, if mail was due to be sent to that server the one that was still working I am not able to figure out why
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BusbarSolutions ArchitectCommented:
sorry can you explain more.
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