5.5 to 2003 migration, changing IMC before mailbox migration

I am in the middle of a 5.5 to 2003 migration, I have a couple
mailboxes migrated for testing, and no public folders are migrated
yet. The ADC seems to be working fine, messages are delivered to
recipients across the servers.

Due to the amount of spam I am getting (the poor old 5.5 server just
can't take the volume anymore), causing errors in IMC, can I change
it so the new 2003 server is running the IMC instead, without
affecting the mailboxes that are not yet migrated? Will the new
server automatically route mail correctly to recipeints on the old
server?

Sean

[Fitz Crittle [MSFT]]

As long as the 5.5 objects have been replicated to AD, Exchange is
configured to handle the inbound SMTP traffic and send over to 5.5 via the
MTA. If you want Exchange to handle outbound also, see the steps below.

On Exchange 2003 install the SMTP Connector (it's critical that an address
space be defined), then wait for that connector to appear in the Connections
object in the 5.5 Admin as well as in the Site Addressing, Routing Tab on
the 5.5. Once it does, that means 5.5 sees the SMTP Connector on E2K3 as an
available route. The remove the address space from the IMS and restart it.
Then on the Site Addressing, Routing Tab, click "Recalculate Routing" and
you should see the IMS be removed from the Routing tab, at this point
Exchange 2003 is configured to handle the outbound message flow.

Thanks,
Fitz Crittle

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<sean@nospamemail.com> wrote in message
news:3f8du0h38h2f6ku4138kfilt5q0f7505du@4ax.com...

I am in the middle of a 5.5 to 2003 migration, I have a couple
mailboxes migrated for testing, and no public folders are migrated
yet. The ADC seems to be working fine, messages are delivered to
recipients across the servers.

Due to the amount of spam I am getting (the poor old 5.5 server just
can't take the volume anymore), causing errors in IMC, can I change
it so the new 2003 server is running the IMC instead, without
affecting the mailboxes that are not yet migrated? Will the new
server automatically route mail correctly to recipeints on the old
server?

Sean