Removal of Routing Group Connectors in Co-existence environment


We are currently migrating from Exchange 2003 to 2007 in our environment.

We had five 2003 Admin/Routing Groups  to start of with (representing each continent). This increased to siz Routing groups when we built the first Exchange 2007 servers (as you know Exchange 2007 servers form their own special routing group regardless of location). We created Routing Group Connectors from the Ex2007 RG to all the five 2003 RG's.

One of the RG's, Australia, has now been migrated to Ex2007. There is one 2003 server left in Australia, and that is the 2003 Bridgehead server (Aus2003BH) that is connected to the 2007 RG and the four other 2003 RG's.

We need to remove Aus2003BH from the Exchange org. This will require that we remove Aus2003BH from all the routing group connectors. However, since Link State Updates have been disabled, I am worried that Exchange 2007 will not know that the connectors containing Aus2003BH have been effectively removed.

What's the best way to remove Aus2003BH from the routing group connectors that it belongs to? I want to make sure we don't get any strange routing - especially considering each RG represents a continent and we also have AD replication to take into consideration here. The AD replication between continents is 60 minutes - does this mean that the removal of the connectors will take up to this time to propogate between continents?
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the routing group modification will take time to propagate that's for sure since it will happen with AD replication.

But since your server in Australia has no longer any mailbox on it I don't see why removing it from the routing group connectors will cause you any routing issue is Australia a hub site?

I have done this many times for clients connected in different part of the world and I haven't run into any serious issue I can remember of.
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