I recently upgraded the back up agent on the passive node of my exchange cluster and rebooted the active node so that the passive would take over. All went well and the passive node became active. I was able to back up the server as planned. The next thing we knew we started receiving NDRs from messages that were dated as far back as 6 months. We also got calls from customers asking why they were getting old mail from us. We got reports from our users that messages that they sent out months ago but were never delivered were being received now. Has anyone heard of this before or have any idea what could cause it and possibly a fix? I am running Exchange 2003 enterprise on Windows 2003 enterprise SP2. The servers are in a Microsoft cluster with shared SAN resources. The clients use a mix of Outlook 2002, 2003 and 2007. When I look at the queues now on both servers the appear the same. Any help or guidence at all would be appreciated. Thanks, Jrussell97

Hello JRussell97, Please Stop the SMTP Resource on the cluster and Rename the mailroot folder to Mailroot.old on both Node. After that Start the SMTP resource from the cluster administartor. It will fix the problem.MicroSoft Exchange Admin. & Connector EXCHANGE2010, MCSE, MCTS, MCSA MESSAGING, CCNA & GNIIT

Thank you for tis suggestion. I will try this as soon as i get a maintenance window.