Final step in Exchange 5.5 to 2003 migration but one last question

Our exchange replication was not in sync with AD when we moved all our mailboxes and public folders over to Exchange 2003.  Now we have a full AD site with Exchange 2003 and there are no more public folders or mailboxes on any of the Exchange 5.5 servers.  However we still need to keep one last Exchange 5.5 server for an efax application, but it is only for the directory, no mailboxes are used.  However because of the lack of sync with AD/Exchange 5.5 directory, the Exchange 5.5 recipients show many users who are in reality now located on Exchange 2003, but still show as if their mailboxes are on Exchange 5.5.  AD is completely accurate, but the Exchange 5.5 directory is now.  If I try to delete one of the Exchange 5.5 servers from the Exchange 5.5 admin app, I get the warning that any remaining mailboxes will be deleted.  

My question is if Exchange 5.5 thinks there are still mailboxes on Exchange 5.5, if I delete a server will that cause any replication into AD and cause potential problems deleting real user mailboxes on Exchange 2003?  We have the ADC running and SRS still operational.  I just don't want to delete a server and then have a replication event happen and cause deletion of mailboxes on Exchange 2003.  I know its probably not even a possability, but if anyone knows how this would work in theory, please get back to me.

One of my thoughts was to delete the Exchange 5.5 servers we don't need in AD using ADSIEDIT, since that would free up some of the MTA and small annoyances of leaving the Exchange 5.5 servers in the site.  I could leave the required Exchange 5.5 server as is, and it won't know the difference.  But the junk would be cleaned up from AD/Exchange 2003.  Any thoughts?

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If you have migrated the users mailboxes from Exchange 5.5 to Exchange 2003 then there should be no mailboxes left on the system. if the efac system needs addresses these should be contacts from Exchange 2003 (AD) imported to Exchange 5.5 as contacts.

If there are objects left on Exchange 5.5 and you delete them they will not delete the new accounts in Exchange 2003/AD.

I am a little confused as you say the Exchange 5.5 and AD are not in synhc but you mention you have an ADC installed - which should synch the two directories.

I would strongly advise against removing the server using ADSIEDIT as unless you know exactly what you are doing you are likely to cause problems. You need to decommission the server properly


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MCPJoeAuthor Commented:
Correct, there are no more mailboxes on Exchange 5.5.  

If using a two way sync the ADC will delete 2003/AD accounts if they are deleted in Exchange 5.5.

We had to do an authoratitive restore of the Exchange 5.5 directory two years ago which caused major replication issues and the Exchange 5.5 directory still shows many users homed on the Exchange 5.5 servers, when in reality they are moved successfully to Exchange 2003.  

I don't want to use ADSIEDIT, but will resort to this as a last resort if no one has any other good suggestions.
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