On the client computer with outlook
Go to Start>run>cmd
Type this
RPCPing.exe -t ncacn_http -o RpcProxy=fqdn.yourdomain.c
om -P "testuser,yourdomain,testp
assword" -I "testuser,yourdomain,testp
assword" -H 1 -u 10 -a connect -F 3 -E -v -3 -R none -q
where fqdn.yourdomain.com = FQDN
test user = user
yourdomain = domain
password
Explanation of switches.
http://support.microsoft.com/kb/831051Please post back results.