Describes a problem where you are prompted for your credentials when a report returns a very large results set. To resolve this problem, apply the hotfix that is mentioned in Knowledge Base article 826756.
This topic provides guidance about the most useful performance counters to monitor on servers running Microsoft Exchange Server 2007 with the Client Access role installed. When monitoring Exchange 2007 servers, you should know which performance aspects are most important. The counters and threshold values detailed in this topic can be used to proactively identify potential issues and help identify the root cause of issues when troubleshooting.