Creating a "DN Deadlist" to get rid of 9551 warnings from Exchange
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See http://support.microsoft.com/default.aspx?scid=kb;en-us;318549 for background information.
This KB article refers to Exchange 2000 but it applies to Exchange 2003 as well.

To create a DN Deadlist that lists all former accounts from Exchange 5.5 that cannot be resolved to Windows accounts you need to meet the following 
prerequisites:
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- Exchange Server 2003 installed on the target server - should you not have started the migration for a site you should avoid the problem in advance by running the DS/IS integrity check
- All Directory replication must have occurred so that you have all unresolved accounts in the 9551 warnings
- Log Parser 2.2 installed (find it at http://www.microsoft.com/downloads/details.aspx?FamilyID=890cd06b-abf8-4c25-91b2-f8d975cf8c07&DisplayLang=en)

Creating the DN Deadlist
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- Copy all files from this folder to the following local path on the Exchange 2003 server:
  C:\Deadlist
- Run "RunMe-Create-9551-Deadlist.bat". This will do the necessary work.
- Restart the Information Store service.

That's it.
