Remove Exchange attributes but keep e-mail address?

We have an odd situation, but here it goes:

MailboxOld is a "mailbox" but all email is forwarded to MailboxNew without saving a copy. Essentially, it's just a place to bounce emails off before they get to the final destination (don't ask why ;-) ). We want to completely remove the "mailbox" aspect of MailboxOld BUT leave the mailboxold@domain.com address in production so it still goes to MailboxNew

Our original thought was to remove the SMTP entry for the address from the old mailbox and add it to the SMTP list for MailboxNew, but with replication, this can cause some downtime for the address, which would be less than ideal.

Any suggestions?
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parinpatelAsked:
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Exchange_GeekCommented:
"Our original thought was to remove the SMTP entry for the address from the old mailbox and add it to the SMTP list for MailboxNew, but with replication, this can cause some downtime for the address, which would be less than ideal."

Seems you got over 50 DC spread over 5 AD sites ? If not force replication using replmon and replication should be instant - why bother over just one email address honestly. The plan is picture perfect.
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parinpatelAuthor Commented:
The address receives hundreds of emails a minute and these emails are fairly important. If the queue gets backlogged for a few mins for replication though, what would happen to the emails destined for this address? Would they immediately get bounced back or would they be stuck in queue?
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parinpatelAuthor Commented:
Please close case, opened an MS PSS case. Their solution is to use ADSIEdit to change the msExchHome attribute for the AD account in question. We can change this value from the old server to a new server name. Once that's done, the old server will no longer think that there is a mailbox on it anymore, allowing uninstall of Exchange to continue. That's the hope, anyway.
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