I am running an Exchange 2007 SP1 server. Over the weekend I patched my DC and shortly there after I started to get EventID 9646. The starange thing about this is it appears to be left over from an Exchange 2000 server. Now I have tried to research where this is coming and I dont show the mailbox nor any of the other inforamtion wiht reagards to its cn, o etc. Any idea how I can stop these errors? Thanks

Please post the exact and complete error message. Also, is Exchange installed on a DC?

Hello, Generally, we can refer to the following KB article to troubleshoot this issue: You can refer to the following to troubleshoot this issue: http://support.microsoft.com/kb/842022 Thanks, Simon