Hi, I have a Server 2003 with Exchange 2007 that will not logon to the PDC. IP is up as I can browse that ping both ways. Exchange is NOT up ... and will not restart. Error ... Event Type:ErrorEvent Source:NETLOGONEvent Category:NoneEvent ID:3210Date:2008/01/29Time:02:39:43 PMUser:N/AComputer:MAILBOXDescription:This computer could not authenticate with \\server.domain.net, a Windows domain controller for domain DOMAIN, and therefore this computer might deny logon requests. This inability to authenticate might be caused by another computer on the same network using the same name or the password for this computer account is not recognized. If this message appears again, contact your system administrator. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.Data:0000: 22 00 00 c0 ".. PLEASE HELP ... Thanks!!

I've run into this before; try resetting the domain account on the mailbox server, go like your going to change the domain membership, and if your domain is domain.com and the server's membership is listed as 'domain', add the .com; if its listed as domain.com, remove the .com and reboot.