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Exchange to Exchange system migration snafu

Situation: client migrates from hosted Exchange to in house Exchange. All mailboxes are backed up to PST via Outlook, Outlook is reconfigured with in-house account, and PST is dumped into Outlook and up to server. (BTW does anyone have a better method? I've never used exmerge but I know of it...)

Now, emails from prior to the migration have internal recipients on them, obviously. When they are replied to or forwarded, a slew of NDR's come in:

5.1.2 - The message could not be delivered because the recipient's destination email system is unknown or invalid.

Upon investigation, I find that when I double click the recipent on these old emails (which looks nice and tidy like it came off the GAL <u>"First Last"</u>) the  display name reads:

/O=ORG1/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=username

and email tab is blank. Clearly a holdover from the old system.

Where does one start?
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IconicHold
Asked:
IconicHold
1 Solution
 
SembeeCommented:
This is a major problem when you move from one Exchange environment to another.
The only effective solution is to hit reply on the old item and then delete the recipients and select them from the GAL fresh. Then hit send.
Others have said you can do things with an X.500 address but I have never got that to work correctly.

Simon.

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IconicHoldAuthor Commented:
Thanks Simom (seriously are you on here 24/7?). Lots of solutions out there re: NK2 auto-fill nickname file.

Hogwash.

This is the winner: http://support.microsoft.com/kb/313324

It is in fact the only way to globally squash the problem. When you come accross an X500 address (most of mine were in Calendar appointments created pre-migration) copy the whole address. Open the user account in AD, email addresses, new, Custom, paste, email type is X500 and click OK.

Those old names will "resolve" to legit user accounts in AD.

What a b*tch.

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