We run an Windows/Exchange 2003 infrastructure in mixed mode. We have both Outlook 2002 and 2003 clients. As part of a security project, we locked down the domain using Windows 2003 Server Security guide. One of the settings is that we only allow Kerberos and NTLMv2 responses and refuse NTLM. When it is implemented, some users cannot get into Outlook. I noticed in Outlook 2003 there is a Logon Network Security setting where we can specify Kerberos/NTLM. I did not notice this in Outlook 2002, is it compatible w/ Kerberos and NTLMv2? Or am I barking up the wrong tree?