I am working with a client to monitor a large 20K user ORG spread across multiple routing groups. The users are experiencing delays opening email. They have run perfmon for 48 hours with all counters on their mailbox servers. Will also run the exchange troubleshooting assistant. What would be the best way to analyze the data? Any other suggestions? Thanks!

This article explains how to interpret counters for Exchange performance issues: http://technet.microsoft.com/en-us/library/aa995886.aspx These may help you troubleshoot: http://msexchangeteam.com/archive/2005/05/25/405353.aspx http://support.microsoft.com/kb/905803 http://support.microsoft.com/?id=905184 Does your client use Blackberry? Do they have mailbox size limits? Desktop search sfotware (i.e. Google Desktop Search, LookOut, Windows Desktop Search, etc.)?