Microsoft recently offered new information about how to improve performance of the Exchange Server Knowledge Consistency Checker (KCC). The KCC ensures that the directory's information about which sites and servers are on the network matches the actual sites and servers that exist. In performing this task, the KCC can make changes to the site directory to make it match the state of the network. The Microsoft article "XADM: Naming Exchange Server Computers to Optimize KCC Performance" (http://support. microsoft .com/support/kb/ articles/q224/5/92.asp) explains that the KCC searches for servers in alphanumeric order. Therefore, the names you use for the computers influence KCC performance—and the amount of network traffic it generates.
Another Microsoft article, "XADM: 'Denial of Service' Vulnerability in Store Vulnerability with IMAP" (http:// support.microsoft.com/ support/kb/
articles/q230/2/85.asp), discusses a different problem. If you can reach your Exchange server from the Internet via inbound IMAP4 traffic, be aware that a Denial of Service (DoS) attack exists that can make your Information Store (IS) quit responding. A malicious client can flood the server with IMAP4 packets containing no operation (NOOP) commands. Although these commands don't do anything, queuing enough of them can overload the IS. The article describes the available hotfix. . . .
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