Fixing mismatched legacyDN values
We have an Exchange 2003 SP2 server running on Windows Server 2003 Standard R2 SP2. We recently had an incident where several users (but not all) could not connect to exchange and we could not send them email internally (NDR error 5.1.1). We could send them email via an external account, just not internally. We fixed the lack of connectivity by recreating the outlook accounts on the local machine. The NDR error then seemed to come and go randomly. Right now it seems to have resolved itself (for now). After doing some research I found the legacyDN tool and ran it. It came up with 17 mismatched legacyDN values, all of which were the /o and /ou values in various objects. Some background, our environment has been built progressively over the last 7 years. The exchange server was migrated from exchange 5.5 to exchange 2003 about 4 years ago. We separated our root forest into two domains. All of the users who had the problems were users that have had accounts since the exchange 5.5 time period and had been migrated to the new domain. User names have been changed from what they once were to try and bring some standardization to the network (our company size has doubled in the past five years, 25 total users in the local office today). Our exchange environment is shared with another office who also run exchange 2003 and followed the same upgrade path. Questions: Could the legacyDN mismatches have anything to do with our problems? How do I fix the mismatched legacyDN values? I have read that running legacyDN in edit mode on a production server is a no no. I do not have a backup exchange server or a lab to test in. We are on software assurance with MS and already have the exchange 2007 disk. I need to build a new server for this. Would it be best to not monkey with the 2003 server and just rebuild exchange from scratch or are these values going to be migrated over since they are part of AD? Thanks for the help.
June 8th, 2007 4:39pm

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